I'm a guy who got diagnosed with ADHD-PI when I was 28 and it instantly made so much of my life make sense. (I went from an unfulfilling career I hated to self-teaching CS and software dev & getting a job in the field within about three years.) And yes, I also got very strong ADHD vibes from this post. Having said that, I'm certainly not a doctor and there are a lot of things besides "can't stick with side projects" that go into a diagnosis.

But if the OP (or others reading) also experiences issues with working memory, losing items like wallets or keys, following directions (not because you dislike them but because you just can't keep them straight), sleep issues (generally, staying up significantly later than average), physical restlessness such as restless legs, forgetting appointments, lots of emotional impulsivity via outbursts, a very strong pull towards stimulating things like reckless driving, dangerous levels of drinking or drug use, etc., among others, they might benefit from discussing with a doctor.