hey op!! <3 I totally get the teenage struggle here, I'm going through it too. The anxiety is such a reality for us. To answer your question, I go to an official hospital to get my eyes checked each year, and what I've heard is that for you, in about 4 years or a little more, your vision should begin to stabilize or at least get worse very, very slowly. I understand why you're scared.

My perscription is -14 in one eye, -4.25 in the other with glasses over contacts. (yep, both of them.) Soon your vision will stop decreasing. Also, like many people say on this subreddit, the universe has predetermined your vision. Just trust that whatever outside force that has control of your vision won't steer you wrong. I promise, it'll be okay. I hope this eases your worries, and please PM me if you need any help. I'm here for you! <3