I ended up eventually getting diagnosed, even doctors who don't usually prescribe stimulants prescribe them to me. I went from being unemployed and extremely depressed and doing small odd jobs living out of a cheap hotel room, to working at a FAANG like company without even studying for the interview. I am 26 and often wonder what life would have looked like if I got help earlier.
Todo lists help. Exercise helps. Medication did the trick for me.