YOU'RE SCREWED, change your mind now.
I am totally kidding, don't worry. I have actually been reading a lot about people not doing so well in AP/Honors classes in HS but do just fine in college, so I really wouldn't worry about it too much. College of course is going to be harder regardless, but by then you may grasp it easier and think "oh yeah, I struggled with this in HS, I am going to work my butt off to understand it now". Don't get discouraged just by that one class. Unfortunately it is just going to get harder down the road, but you just have to work harder and study harder. You are going to have to take a lot worse than just basic biology. I don't mean worse as in ew that class is terrible, I mean as in difficulty. Physics, orgo, chem, bio, etc. things like that. Now granted, those classes may be a breeze for you in undergrad, and same for other people. So it'd be stupid of me to say that all of those course are super hard because what is hard to someone may be effortless for others. Some people grasp things, and others just can't -- no matter how hard they study or try.
What do you plan on majoring in?