its extremly hard to inflict upon your self an actual lethal wound, even trying to stab yourself in the neck there is a good chance you wont actually make a good enough cut to kill you, and would left u agonizing until you bleed out, thats if you even manage to gather enough force to actually harm you in any way whit a knife except from a fleshwound. even if do all that if anyone finds you out its quite probable youll survive. sucide by self inflected stab wounds its very unprobable only about 2% acutally succeding, i sincirely think it would a lot better if you take some time to think in another method