I'll quote Eminem here.

"'Cause sometimes you just feel tired, you feel weak
And when you feel weak you feel like you want to just give up
But you gotta search within you, you gotta find that inner strength
And just pull that **** out of you and get that motivation to not give up
And not be a quitter, no matter how bad you want to just fall flat on your face and collapse"

Also, for myself, I motivate myself with various websites and google searches over the internet. I am glad to have support from teachers and relatives. I am not battling just depression, I am battling brain damage and abuse. Not only that, I want to make a living helping people like me.