I cant tell my parents either, or they will send me to a psych ward ?

I believe you can fight your urges, it will be a hell of a battle and it will be hard as shit, but I believe in you.

Uh, withdrawal can be either like dying of thirst, or can legit kill someone. It ain't that easy.

We’ll decrease your doses or something I’m not a damn doctor

As a guy who has studied anatomy and physiology in the past: Slowly decreasing the dose (THIS WILL TAKE WILL POWER, just not as much as quitting cold turkey) until it reaches a minimal point can help. Once you think you have it low enough, try getting off the drug for a couple days (like, really try hard). If that doesn't work, go back on at the lowest dose and keep decreasing. I don't know what the drug is, but that works for most drugs.

EDIT (I should have clarified this, it's not drugs it's self harm. I have as of now been clean for a few months :)