Reading your post actually brought tears to my eyes, because it felt like I was reading my own story...
I'm still struggeling with this exact same problem as you, so I might not have any advice to offer, but I just wanted to let you know that you are not alone in the world with this.
If you ever feel the need to chat about your problem with someone who is also going through this, please don't hesitate to send me a pm. I'm no professional, but maybe sharing our experiences with each other might help?
Good luck, and I hope your parents agree to medication for you!