My friend pushed me off the cliff of depression?

So I was standing outside of my school, alone, waiting for my mom to pick me up (I'm 14) and my friend comes to stand next to me. After about a minute of uncomfortable silence he calls me borings subsequently a discussion follows. Later i start thinking about what a loser I am, I stay at home all day, I'm not very good at anything my grades are ok, I have a lisp, I'm not attractive or hot or whatever girls call guys, and I've been on the verge of becoming fat for a couple of years, and the only thing I was proud of was my ability to run really fast and that I wasn't boring but that was wrenched from me today. Im good in a group but not one on one because I can't think of anything to say. Can someone tell me how to escape depression? Please right now I'm wishing for someone to kill me so I can escape depression and go to heaven and won't have to commit suicide. I'm crying as I type this please help me