I Wanna Stab Myself I Put Up A Bandana Around

i wanna stab myself i put up a bandana around my arm and tied it up tight to create pressure but i guess it also stopped the blood flow... is the bandana of any use? actually i want to just loose the "most" blood.. but only from my arm. I know you'll say go ahead with the wrist and razor thing.. no. I wanna stab! alright ok..
Just tell me a few good methods.. to cut/stab myself with a lot of blood loss. it's urgent