Constant tinnitus at the age of 20

I have tinnitus too. Mine didn't start when I was 20, but I have had it for several years now & it is part of an incurable condition.

In most cases, the only "cure" is destructive surgery: removal of the eardrum & other inner ear parts. Total deafness is the result. Good luck finding a surgeon who will do it, unless your condition becomes truly unmanageable. Short of that, all you can do is get used to it & figure out coping tactics.

Ambient music is one thing I use. I keep a few long-play ambient tracks on my phone (no need to stream that way)...sometimes I'll lie down, put a pair of earbuds in my ears & turn up the volume just enough to drown out the ringing. You can use other genres of music this way too, though not all of them work equally well.