Which one?
I found differential calc (I) to be pretty easy. Integral calculus (II) was sort of a challenge, but it wasn't that much harder than differential. Rotating curved lines across the axis and finding the area was probably the hardest topic to grasp, and it wasn't even that difficult. The taylor series and taylor polynomials topics were meh... sorta dry and more boring than the other topics, but it was ok.
I heard multivariable calc (III) is easier than integral, so I'm looking forward to next semester's MV calc course.
Calculus isn't a very hard topic if you are mathematically-inclined and if you study 10 minutes a day. Are you studying? Why did you take the course? Was it mandatory? The only kids I know who take calc in college are engineering students.