ADHD has a clinical definition that needs to be diagnosed by a clinical professional.

ADHD usually runs in families. There will likely be a direct relative who went undiagnosed, but who fits the ADHD criteria. Also symptoms from early childhood onwards - it's not something that just happens one day. It's a lifelong pattern of behaviour.

If you're concerned I strongly recommend you speak with a professional. Everyone's ADHD manifest in slightly different ways and nobody on the internet can diagnose you.

Not OP, but I would say that people's self analysis should focus around examining/describing their own internal existence, not external-view terms from the medical industry. If you suspect you have a problem that can be diagnosed and helped by the medical industry, go right ahead and seek out that help. But regardless you've also got to do the work internally, and externalizing your locus of control onto the medical industry undermines that.