You are the only person in the world who cares about your own happiness. Especially your parents, if you're lucky all they'll want is grandkids, if you have to go through an unhappy marriage to have them tough fucking luck.
Does that make you depressed? Yeah, maybe, if you can't do a fucking thing about it. But you can. You're here reading this, you're capable of at least some action. You care about you, so treat yourself right and make yourself better.
Then when you realize that precisely because nobody gives a fuck, the meaning of your life is yours to decide, and the world is yours for the taking, congratulations. Go out and get some.