i'm betting you're actually pubescent rather than prepubescent if you're 15.
You're going through puberty, right?
More to the point though: you have your whole life ahead of you and there's a lot out there to explore and enjoy.
I'm nearly 20 years older than you, my life currently sucks, but still, I look forward to it being better.
To finding a lady to be mine.
To partying and dancing to music.
To becoming self-supporting.
To sex & drugs & rock 'n roll.
To games.
To interesting conversations with people.
To traveling the world again.
That's just the tip of the iceberg, my young uncertain friend.
You haven't taken your life out of the box and played with it yet.
That's what you have to look forward to.
In the meantime, you have free food, shelter, and toys.
Enjoy that while it lasts. 