Buddhism is not the answer. Buddhism is not the problem, either.
You turned to Buddhism looking for a quick fix to your life, and now that you haven't found that quick fix after 6 years you are lashing out. I get the impression there is a lot of pent up anger in you. Anger at the world, anger at your job, anger at the so-called "better off" people who earn millions for doing nothing, and now anger at Buddhism for not fixing it for you.
Buddhism is not a quick fix. It is not the answer.
Buddhism is merely a toolkit which enables you to fix yourself.
Meditation is not Buddhism. Going on retreats is not Buddhism. Reading the Pali Canon is no Buddhism. You can meditate all day every day for the rest of your life and not find happiness. You can read every Buddhist work ever written and not find happiness.
Turning to any religion or philosophy and expecting it to put right everything that is wrong is not how to make things better. All you are doing is finding a new target to point the finger of blame at when it doesn't "do it for you".
Meditation doesn't create happiness. It merely calms and clears the mind washing away the unimportant cares of the world and allow you to focus it on what really matters. The mind is "like a rampaging elephant". Only when it is calmed and tamed can you sit on its back and make it go where you want. Meditation calms and trains that elephant.
You can read and learn every bit of musical theory you can get your hands on, but it won't make you a concert pianist. Only practice will do that for you. It's like that with Buddhism. You can know all about it, but if you do not practice it (and by that I don't mean meditating every day), Buddhism will not do anything for you.
The majority of people's problems with the world - not finding their place in it, not being happy with their role in life, not liking what they are doing, etc - is not because the world is at fault. It is their view of the world that is wrong. "With our thoughts we shape the world" is one of the truest phrases ever uttered. You cannot change the world. You cannot even change other people. The only thing you can change is yourself, and that starts with changing how you view the world.
No, it's not an easy task. But that's what meditation is for - to help you keep focused on that task.
As an example:
"You have been in a succession of low-paid menial jobs and don't earn enough to make ends meet."
There are two things wrong with that statement, and both highlight the problems of your world view - of your perception of life. You are not in a "menial" job. You have the good fortune to be in a job that is free of stress and responsibility. Do you really want to be paid lots of money for doing next to nothing? No one is paid lots of money for doing next to nothing. They are paid lots of money to take the fall when things go wrong. They are paid lots of money to make the business decisions that affect the lives of thousands of employees. I for one wouldn't want the stress and responsibility that rests on their shoulders, not for all the tea in China.
You don't have a menial job. You have an easy, care free, job.
If you aren't happy with where you are it is through a desire to be something you are not. A desire to be someone else. You are who you are, not who the media says you ought to be. In the words of Crosby, Stills and Nash: "If you can't be with the one you love, love the one you're with". Most misery in life comes from wanting what you can't have - and if/when you get it you then want something more. That wanting, that craving, is, as Buddha taught us, the cause of all suffering in the world. When you let go of that craving for something else and accept who and what you are, that is when peace and happiness begins.
And you can't make ends meet? So move the ends. Some people get a longer piece of string, and you know what happens to long pieces of string: they always end up in a tangled mess. Some steal someone else's string and tie it to their own.
Or you can try tying it around something smaller. Do you really need a new fancy mobile phone? Do you need that pair of earrings?
A Buddhist Monk has nothing except a razor and a spare robe. My favourite teacher, Ajahn Brahm, tells a story (one of many, he does love his stories. You should look him up on Youtube, his way of teaching will open your eyes). I forget if it was actually about himself or another monk, but it basically goes like this (I am no story teller, so forgive me):
A monk, it may have been Ajahn Brahm, or his teacher, Ajahn Chah, or someone else, I forget, had been giving a talk to the lay people. It was a good inspiring talk, and afterwards one of the lay people came up to the monk full of gratitude and wanting to do something in return. Monks aren't allowed to have money, so he said to the monk "I have $100 here for you. I know you can't have it, but if you tell me what you'd like I'll go and buy it for you."
So the monk starts thinking: what would I like? The first thing that comes to mind is "a piece of paper to write a list on". Then he thinks "And a pen to write the list with". It starts to get dark, so he thinks "a torch so I can see at night would be good too". Before long his list has grown and grown and grown, including such things as a cushion to sit on while meditating, a new bowl for the alms round, etc.
The next day the lay person comes back to see what the monk would like him to buy. The monk says to him:
"Don't you ever do anything like that to me again! I was in torment all night, tossing and turning, making a list of things to get. It was hell!"
... Or something to that effect anyway. The point is, when you start becoming attached to the world like that it only breeds more attachment. And that attachment breeds suffering. It leads to a desire to have more, a desire to change who/where you are through the accumulation of "things".
It is only when you start being a Buddhist, instead of learning about Buddhism, that your life will change - and that change will be instantaneous and surprising.
I myself rarely sit and meditate. However I am almost constantly meditating. Meditation isn't just about sitting in the lotus position going "Om". It's about being still within yourself. I am meditating right now whilst writing this. My mind is calm, my thoughts are clear. I'm financially broke. Both Trump and Kim Jong-Un have silly hair. Life is great.