I feel sorry for you because I can relate. I had to drop out of university in second year, not because I wasn’t smart enough, but because I couldn’t keep up with the pace.
I’m 43, divorced 10 years, and messed up the couple relationships I’ve had in the meantime. Sadly you’re right, it never goes away. Only recently have I realized how many screw ups in my life have been the result of ADHD. The only good news I can offer you is that at least you’re young and know what you’re dealing with. I only figured out what this is 5 years ago.
Best of luck to you.