I think I'm the biggest failure... I can't stop crying?

I'm at the end of my tether, Lately I can't seem to do anything right. Everything upsets me, and when I get upset over nothing, people get angry with me, Its my family, my driving instructor, in some cases my friend tell me to stop whining, I can't seem to rely on anyone anymore, I'm very close to contemplating suicide. I think everyone is better off without me, is there anything that can stop me crying?