Kinda sounds like you need to sort some old stuff out first. I don't know what it is that is eating at you, but it will continue to eat if you let it.
There is probably something you want out of life, but you just think it's impossible. I don't know what that may be, but there's a chance that it's something that a LOT of people have done. And those people aren't any better than you. No one is better or more important than you.
I'm not ambitious either. A part of me actually didn't WANT to be successful because then my family would get to swagger around all smug, thinking they did something right. A part of me always kinda thought that if I turned into a suicidal loser, they'd learn some kind of "lesson".
But that shit gets old and the only person that ever suffered was me. You don't have to want a lot out of life. I don't see anything wrong with just making a small living and having more time to spend doing things you like.
If you feel that someone has wronged you, call them out on it. I wasted a lot of time hating people in secret. I'm making a lot of assumptions here, but I'd rather be wrong than take the chance you continue to suffer in silence...
Try writing more, try finding better places to publicise it, try thinking about how you can improve on your story. Feedback shouldn't be limited to good/bad, it's really about improving your skills. You can write, so it's a start, but implicitly by starting you have the goal of improving. There is also, of course, life beyond your story. If you feel that the rest of your life is depressingly empty, you implicitly have the goal of making it less so. Most importantly, you have the goal of finding things you enjoy and doing them.
So you have goals, whether you like it or not, it's just a question of how you can aim to achieve them.