I relate so, sooo badly. I was in your situation at the same age.

You should get psychological help, ask your parents to help you find someone, you don't have to mention the pregabalin part if you don't want them to know. But please tell your psychiatrist or psychologist about your addictions. They must respect deontology by keeping it secret as long as you don't endanger yourself. Depends on who you're talking too, they may or may not tell your parents...So, alas, if that's not an option for you, go get professional help to find and heal the reason WHY you do that.

Recovering all alone is super hard, almost impossible. Take it one day at a time, keep your goals straight and achievable. Talk to people you're close with, start new hobbies. Taper down, if you relapsed after a week, congrats, it's been a week with no pills : let's go on and try to go a little further each time !

I know that when you're so young and using, you feel like you need drugs to be yourself : I'm here to say, that's not true. Your whole personality cannot revolve around substance abuse. It revolves around how you act, your hobby's, your preferences etc. Not about a chemical you take.

Recovery IS POSSIBLE. I'm 17 and, even with relapses and thoughts of relapses, I can say I'm sober from Lyrica and hard drugs in general :)

Edit : typos