I have only an informal understanding of Buddhism, so please excuse the informal language used in this question. My intent is to understand Buddhism better, and I welcome any answers or resources that will help me do that.
Being present is focusing on the here and now, because that is all you ever have. Not striving to feel differently, just accepting and observing what is. It is my understanding that this mindset helps do away with the suffering that comes from an over fixation on striving. In other words dropping the expectation that if only this one aspect of life was different or you had a little bit more money you would be happy. Unless your circumstances are truly dire and your basic human needs are not being met, striving for a change in life is a recipe for always wanting more and not being satisfied. This seems to be consistent with the concept of hedonic adaptation.
It is my understanding that part of accepting the present and non-striving is believing that every road has an end. Every career path chosen, every hobby taken up, every life decision made will ultimately come to an end in one way or another, and there you will be on the other side still only having the present moment. This is a deeply depressing mindset to me. Viewed through this lens, what is the point of doing anything? Why strive for an experience or accomplishment when it is fleetingly temporary?
There seems to be some critical components missing from my understanding of these aspects of Buddhism. What am I missing?