Hello,
First, congrats on 100 days, and two seniors in HS, lots to celebrate there.
I know it's difficult to make decisions early on, but there are a few red flags, at least to me. The biggest one is him pushing you while at an amusement park. That is never okay, under any circumstance.
It sounds like you are doing well on your own, maybe taking some time just to get to know you for a bit would be helpful.
Whatever you decide, I wish you lots of love and happiness in the future.