Is ADHD even real?

I'm undiagnosed but have been certain of having it for years now, since it literally PERFECTLY explains my whole life! (Like nothing else does)

The problem is, I'm scared that ADHD isn't actually real and I'll find out after I die that, the whole time, I was never disabled and I simply just let my nafs and laziness and desires take complete control of me. Like, everything that went to shit because of my constant exhaustion to do literally anything [SKIPPABLE details: it's to the point I can barely brush my teeth even once everyday. Nowadays I do absolutely nothing everyday except pray 3-5 times, and SOMETIMES do the basic hygiene tasks. I study maybe 5 hours a month, and never spend time with my family/friends because it requires Thinking and that's tiring and hard to do for long. I constantly ghost my 2 best friends for 2-3 months when everything starts piling up to an overwhelming extent] really WAS all due to my voluntary actions. That nothing is really as hard as it seems to me, and I only find it hard because I made it hard for myself by doing less and less over time. And, of course, I'll be punished for it.

I'm really terrified of this possibility and I'd appreciate it very much if anyone could explain their perspective, proving or disproving ADHD's existence