Cancel it. If it lowers your credit score at all it should only be by a few points and then ask yourself, what am I really going to use my credit score for anyway? You don't want another credit card, so you do need to worry about your credit score right now.

When you are ready to by the house, years from now, your credit score will be calculated on an entirely different algorithm based on your age and income at that time.

If you can get yourself out of the habit of using credit in college, you'll save yourself the pain and trouble that so many people twice your age are feeling right now, putting 20-50% of their monthly income toward their credit card interest instead of toward their lives.

Cancel it.

I agree with the people saying to keep the card and use it when you need it. Having that card can be good for you in a pinch, you just need to make sure you aren't overusing it if you have a limited income