what really got me into this misanthropic state is the suffering of so many animals at the hands of humans
Humans mistreating animals used to bother me when I was younger. Now when I think of it, I think that animals mistreat other animals too -- there are predators, parasites, bullies in the animal world -- and if humans do the same then that's just humans being like animals, which needn't be too surprising. You can try to be "better" or to do better than that yourself, for example "kinder" -- but your being "misanthropic" maybe isn't the right way to do that.
Buddhism recommends states of mind as appropriate for social interaction -- the four brahmaviharas.
And the suttas are full of stories or examples of recommended ways to think and behave, recommended attitudes -- one that comes to mind is SN 35.88 where a monk describes a people with a reputation for being fierce and rough as being "civilised, very civilised"!
There is no enlightenment
I find that Buddhism suggests that "suffering" -- not physical pain, but mental anguish -- arises from a sense of loss: for example, losing loved ones (family and friends), losing wealth, health, reputation, losing pleasurable feelings, etc.
That was the type of problem for which I found Buddhism especially effective.
I'm not sure what you think "enlightenment" is.
I'm pretty sure from my own experience that there is such a thing as there being more, or less, (mental) suffering; better or worse (more or less ethical) behaviour; more or less mental concentration or absorption (not distraction) in the task at hand -- and looking back, remorse or no remorse resulting from your intentions.
I feel like I have no more answers, only confusion and questions, and i also feel like I've reached a point where I'm so fed up
There are a couple of Buddhist doctrines that might be relevant. One is expressed the opening verses of the Dhammapada:
Mind precedes all mental states. Mind is their chief; they are all mind-wrought. If with an impure mind a person speaks or acts suffering follows him like the wheel that follows the foot of the ox.
Mind precedes all mental states. Mind is their chief; they are all mind-wrought. If with a pure mind a person speaks or acts happiness follows him like his never-departing shadow.
So you ought to cultivate a "pure" state of mind -- both for your welfare and for the welfare of others.
Another thing is that Buddhism identifies many types of mental "impurity" -- see for example:
I think that you're meant to be aware of these states as they arise, or aware of the suffering associated with the state -- and let it pass somehow (perhaps by figuring out what's causing it, and not attaching to or identifying with it, not viewing it as "right").
You may find it difficult or at least non-trivial, more specifically Buddhists tend to describe it as "gradual": it takes practice; and perhaps other factors like some knowledge of the doctrine, good friends (role-models) to learn from, and developing good mental habits and insight.
Emotionally I suffer because I can't make even a dent and physically because I work hard to help out as many as I can
I think a big part of it might be recognising these mental impurities as being problems in themselves. For example, you might think that mental confusion is the result of inability to alleviate the suffering of animals, and that the suffering of animals is the problem -- and that to solve the confusion you need to solve the problem of cruelty to animals, which is currently beyond your ability. Instead you might need to recognise confusion itself (if and when it arises) as being a problem to be solved (or a state to be let go of), after which you might be more effective in doing whatever you can.
As for "faith" I'm not sure how that relates the question -- i.e. how faith used to motivate you and what you no longer have faith in. I guess I have faith in that the doctrine as I understand it seems intellectually sound (so it's understandable), and usable, effective.