Screw Up

I'm such a screw up. I know that now. I'm losing everybody. Even the person i never wanted to lose. It hurts and i don't know who to talk to. Everyone blames me for it..even me. My friends don't exactly blame me but i know that deep down they know that I'm a screw up. It really hurts. I don't know what to do..
I'll give anything to do undo what i did and make it better and not screw up.