College Freshman Advice? (How Many Credits?)?

Okay, so this is probably going to be a little long so hang in there.

I am attending a community college that you need 60 credits to get your AA Degree from.

I have 28 credits that I got taking classes when I was still in high school

Now, at my college, I am enrolled in 7 classes, which are worth 18 credits. The kicker here is that I am only getting 15 credits that count toward my degree because I have to take a refresher math course. (The placement testing seemed a bit faulty to me since I took Pre-Calc in high school and got A's. I think it is a bit ridiculous that a ten problem, randomized, online questionnaire can supposedly determine your ability to pass a college level math class but WHATEVER.)

Now, since I am taking so many classes, I am concerned that I bit off a little more than I can chew. How many classes should I be taking? How many credits?

My goal was to graduate in the spring with my AA, but to accomplish that goal I would have to keep my long schedule and have a similar one for next semester.

My real issue here is that I am a bit of an introvert and three of the friends I am going to college with would be graduating without me, and I would be forced to stay here on my own.

I feel as if dropping classes and taking an extra semester would put my life on hold and put me behind my peers, while taking the courses I am now would make for a rough year.

I really want to graduate in the spring but I have no idea if that is a realistic goal.

Any advice?