I want to kill my self or run away. i just need to get away but where do i go?

over this past month i have changed a hell of alot. i used to be a good girl and i was always happy. then i hit 7th grade. i got made fun of hared and hazed. i started cuting and i wrote a suicide note. i also started to send naked pics of my self to guys when they asked. well my mom found out and we talked and she basically told me its ok and i can always talk to her. welllll that didnt help at all bc she just dosnt get what i am going threw. and i try to talk to her about it and it just makes things worse. i have been thinking of ways to kill my self. i want to leave. my grandpa lives with in 15 minutes of my house. i think i want to try to live with him but how do i ask? i just really need help