Sounds quite like my experience. I got diagnosed at 28, which is more than 10 years ago now. The good news is that ADHD is very treatable, the vast majority respond well to medication (it may take trying a few different ones though), and even when you don't, there are many other treatment options. Medication is the most effective because it goes closer to the root cause, our brain's biochemistry.
Damn, 10 years ago there were less studies than now. I read in ADHD 2.0 book that ADHD is one of the most treatable disorders and it's so amazing how they're able to understand the science behind it. Taking my first stimulant was very mindblowing to me... after 10 minutes I can just function without having to struggle??? It's amazing lol.
I hope you're doing well!