Hey, I'm 22 and been going through this since I was 14 too so I completely understand how awful it is to deal with this for your entire adult life. I know how it can feel like it's totally ruined what are supposed to be the best years of your life, although if it helps I have a friend who is nearly 30 who said she was miserable until she was 25 and thats when her life started to get better, so don't believe what they say that it's all downhill from there! Her story is what keeps me positive that eventually things will start to get better for me too.
For me the only thing that helps is to just keep myself super busy because the second I'm not and I'm alone is when things start to go downhill, I wish I could give some more productive advice. Sending hugs xx