Hey Mike: chillll.
I know how you feel-- I myself am not too hot at math, and ever since I was in algebra I in 8th grade, I had dreaded the day that I would take calculus. I've always struggled in my math classes, but I always managed to learn all the material in the end thanks to very persistent (and very patient) teachers, and now, I'm in calculus.
I swear. It's not so bad. I'm actually passing the class (I jump for joy for B's!). Although I won't always know what's going on in class, I am definitely not one of the kids in class who are always
Bottom line: If you can pass pre-calc with an A (assuming your pre-calc class itself is decent), you'll probably do fine in calc with some self-perseverance and an awesome teacher. But for now, just concentrate on pre-calc, righty-o? That stuff saves.
And btw-- don't trust everything you read on here (not saying that this post itself is false...!). It's the freaking internet, maaan.