How do I stay happy while being poor?

I'm really unhappy because my family is really poor. There are days when I don't at all because there is nothing to eat. I'm in high school, I have a job and I work like a slave and I'm still poor. I plan on going to uc irvine in the fall but being real poor is making me want to not go anymore. Today my parent sold my bike because we need the rent money. Today is prom but i couldn't go because I couldn't afford it. I can't even go to my graduation. I'm really depressed and I have to pretend like everything ok. How do I cope with this?