I Dont Know What To Do....Advice?

sometimes i just want to explode. usually at school im calm and stuff and i never really get angry or anything like that, but in the mean time, inside, im just about to snap. i get angry at everyone then depressed and sad about it then ill just really snap and not know whats going on or what to do about it. sometimes for just no reason i start to cry, but then i feel better when i do and try to cry some more, but then it just stops. i dont know how to deal with all these feelings or urges to just explode and kill everyone. i just feel so overwhelmed and i dont know how to deal with it
any advice?

talk to your parents, a teacher a councellor or a doctor.

They're all there as options for you, use them.

Be honest and open.

Did you read what I said in the other post? I'll post it again here anywayz.
Its proberly just hormones, mood swings and bad temper. I know you've proberly heard this a million times, but try counting to ten, or thinking of something that always makes you laugh, and breath deeply and slowly. Make sure you don't hold these feelings in and let them build up, write them down in poetry etc. and do not hold your tears, let them out, its good. Hope things get better xxx