Help, on the verge of k!lling myself :(((

I don't know what to do or who to talk to... Highschool's over, my friends left me, and I'm stuck at home for a lot more months to come... My situation is so fucking hopeless, and my mom just laughs at me and doesn't understand me. Whenever I open up she says I'm "too old" for this shit like wtf.. And I just got beat up and she doesn't care if I kill myself apparently..... I wish someone could help, idk why my life is this way .. What did I do wrong? :(