Ditto what BleekerSt_Girl said.

Check out the storage situation at your campus. Take a look at what other students are riding. Make sure yours isn't the nicest one on the rack.

If there is a more secure option, like a bike locker, get on the waiting list asap.

It can be challenging (and expensive) to find something that fits if you're petite -- I think there are a quite of few of us on this board -- but you won't want to invest a lot of $$ if you're storing your bike in a place that is easy pickin's for thieves.

My commute is about the same distance, and having recently been a victim of theft, I decided on a folding bike so I can keep it safely under my desk at work. That might be something to consider if you have your own space at school.

Plus -- that dream bike will be a sweet graduation present to yourself!

Good luck in school!