You should probably get diagnosed before medicated. ADHD has overlap with a ton of other mental illnesses. Maybe you're autistic. Maybe you have BPD. Or are bipolar. Or just depressed.
Jokes aside:
It was the memes that piqued my curiosity, then got me reading more formal sources, took an ADHD self test which I scored fairly high on but there were a few things I didn't really see in myself. Waited a year to see if it was just me obsessed wiith another idea that would go away like all the others after a week or two.
Well I couldn't shake the feeling and now that i knew some of the symptoms to look for, I was noticing the symptoms I hadn't thought applied to me before.
Anyway, I went to a doctor and a therapist and am now, for the first time in my life, developing positive routines and habits and enjoying things that aren't exceptionally interesting.
tldr: saw myself in a meme, doc agreed, now i take pills that make life easier.
I kinda want to be a bit more sure myself before going to doctors and such, because a lot I've heard about ADHD seems eerily familiar. (Heck, more familiar than Asperger's which I actually HAVE been diagnosed with, but I heard the two tend to go hand in hand anyway. Would like more sources on that, though.)
A big part for me was also going through the DSM-5 and using that to diagnose myself using the official criteria. Ended up finally getting medication that works for me (after fighting the US healthcare system for like a year) and I take it when I need to focus up for the day, assuming I actually remember to take it.
DSM-5 via Anna's Archive (I'm on mobile right now so I haven't checked how good this pdf is but there are a bunch of other versions if this doesn't work)