i cut my arm all up lastnight kinda hurt but i am fine i didnt go too deep just deep enough and im scared know to tell anyone and idk what to do

hi i am new to this sight and just wanted to say that i have depression and problems with people and talking i am a cutter and very suicidal. so i kinda need some help and ideas on anything that could help me. i am only 18 and im a very shy girl