Dude...i've been going through shit like this since I was born pretty much...So I think I can help. Bascially you just have to love life. Love what you know you have. Love what you can, while you know you can. Don't focus on being angry,depressed,spiteful,etc....be happy, but realize you probably can't always be happy. Sure there may be no "purpose" in life, but thats no reason not to live. There is no real purpose in anything, you just make whatever you want your purpose. All you have to do in this world is live, and die. What you do inbetween is up to you, I suggest you make the most of it.