I got all C's in my first semester of college because I was dealing with multiple issues (healing from a car wreck, grieving over a loved one that died days before school started, etc). I think I withdrew from a class in my first semester, too, but I can't remember. I didn't do that well in my next semester, either, because I was hospitalized so I got withdrawn from two classes and had incompletes on the other two (I did manage to get B's in those two however). Every semester got a little better and eventually I figured out how to manage my time, how to study better, and how to pick out teachers that would be the best fit for me. Now I've been getting straight A's for the past two years.
I think most people don't do their best in the first semester of college. However, persistence will pay off. You can get the hang of it.
Some tips:
*Make notecards to study with
*Read a little bit of your assignments every day - don't cram for tests at the last minute!
*Work on homework well in advance of the due date and do it in small parts instead of all at once
*See if your textbook has a "companion website" -- a lot of textbooks do have those now. They usually have chapter by chapter study tools like flashcards, quizzes, and so on.
*Rewrite your notes
*Look up professors on ratemyprofessor.com to find out who's the best and who's the worst.
*Don't take a ton of classes at first because that can be overwhelming when you're new to college. Just take 1-3 classes and allow yourself to get the hang of it.