It's good that you have ambitions at this early stage. If your ultimate goal is to get in to dental school a) you don't need to get an associate, there for you don't need to take class and who don't need to take astronomy or geology. I agree with UCSFx2017. Even if I get paid to those classes, I wouldn't take it. Having AS compared to B.A. or B.S. is pointless. A.S.+B.A/B.S. vs B.A./B.S.? same thing to adcoms. People getting B.A./B.S. already have the amount of classes needed to get A.S. Same advice, knock down only G.E.s at CC. Don 't get A.S. to impress adcoms.
When I took a class at CC, I met this guy (17yrs old), who had finished biochem1 (all other prereqs with As), now that is impressive at least to me.
It's admirable that you are dedicated this early, but don't take unnecessary steps. If you have free time, explore about life. There are more things in life than socializing, planning for future
Good luck