I didn't get diagnosed until my late 20s....this is why.
Why the hell does this keep happening? I still hear horror stories of how people struggle for half of their lives and nobody stops to think "this isn't normal, we should see a doctor" and it just infuriates me.
Please, if it is negatively effecting your life or you get into arguments about it and it's effecting your social or home life, see a doctor.
College was really hard for me. A big bundle of distractions at a vulnerable age in my life. I about failed out twice out of STEM degrees. I finally found a Liberal Arts degree that I could get a BA in.
Then a few years later, I had married somewhat. I went back and completed by STEM degree, somehow.
Now I'm back at it again 20+ years later, working on my Masters in IT. It takes all of my ADHD coping skills. Making lists. Exercise. Counseling. Supporting friends and family.
I was able to get an adult ADD diagnosis in my 50s from my mental health counselor. Which was forwarded to my PCP. Only then I was allowed to start meds.
I have heard it's notoriously hard to get a diagnosis as an adult.
This sounds a lot like my experience. I've been debating going back, and hearing others have been able to accomplish it alleviates some of my concerns.