Calculus is a major basis for a great deal of math that you most likely will learn in the future. Calculus is also a major basis for quite a few other things, such as physics. If you are so strong at math that taking calculus this early is even a possibility at all, then it is very likely that you are going to use calculus quite a bit in the future. This is something that you want to learn very well.
In my experience, students who are very well prepared for calculus tend to find it straightforward and do well in the class. I have heard that students who are not as well prepared can suffer in the class.
You want to learn this very well. It is worth taking the time and effort to be very well prepared before you take calculus. As others have mentioned, you are already well ahead. I do not see the rush.