Depressed, insomnia, hate everybody and everything, what's wrong with me?

I'm 18 now, but ever since re-occuring deaths in my family/friends over the course from 13 until now, I've been hating everyone, been depressed more, and my insomnia is becoming worse. My friends won't understand, when ever some one brings up the past I just yell at them and such, and leave. One girl tried changing me, it didn't work. One person said crying is the best way to cure it, but I can't. It seems like I'm frozen and can't go forward and move on, and I can't go backward. Every day is a repeat, like it's exactly the same. I don't know what to do. The weird part is, I give advice to my friends and it works out great for them, but I can't even follow my own advice. I ******* hate everyone and everything it seems.