Generally, I struggle with structure and organization. Scheduling my entire day out like you're doing overwhelms and stresses me out. I almost always default from schedules after following them for a few days. That might be what's happening in your case too.
As far as 9-5s go, you might not necessarily have a problem with working a 9-5, but more so that 9-5s are usually "rinse and repeat" like you said, and that's boring. You probably want something that is fun and not strictly do X, then Y, Z, take a break at A...that type of stuff. Some 9-5s are not like that.
Lawn Tennis sounds super fun. Enjoy, man. I think you're handling this just okay and you'll get a hang on it soon.
You think it is easy to schedule my day? 😂 Still adjusting.
As for the 9-5 yeah, you're correct, the issue isn't the job it's the repititiveness, if the job will allow me to take some breaks and do things my way, I'll be far more productive tbh.
Lawn tennis is fun. Still getting the hang of things but from what I've seen It's something I enjoy and seems like something I could become very good at if I keep playing.