It is OK to choose what suits you. I think it's also understandable to have some mixed feelings.
For many years I worked P/T. During the non-work time I was either studying to get qualified, or looking after my kids. I became frustrated (like the OP) by the lack of higher-level opportunities that were P/T and decided to take a F/T opportunity when they were 9 and 7.
It's been a mixed success. I enjoy the work, I no longer feel bored and overqualified, and I have flexible working so still do school drop-off (husband does pickup) but I find it more difficult than I'd expected to have a life outside of work.
I no longer do any hobbies (this crept up on me - I'm trying to change it) and haven't had a night out since before I changed jobs. I want to spend the evenings with the kids but it does push out what I might tentatively call self-care (no gym sessions, no yoga, no relaxation). My husband is at home as he has a chronic health condition, so he's the default parent, but because of his health he can't take on the entire load of household tasks (he does do a lot, I hasten to add). And I hadn't realised how dependent I'd become on the ability to run no-kids errands on a weekday. We try to keep weekends as family time but it means some stuff (home renovation, errands) is not getting done.
At work, starting later than the rest of my team is mostly fine but means I really have to hit the ground running - ie no prep time before early meetings - so have to be more organised than comes naturally to me. And I have to keep a really close eye on my flexi-time allowance as there are family emergencies and meetings at school during the day (one of my kids has SEN) and again, husband can't do 100% or sometimes needs me there as well.
So... overall it's better than the very limited hours I had before, but if I had a chance to go to 4 days a week, I would. That's not feasible in my current post.