How can I get over my commitment phobia?

Only way to get rid of phobias is to face the phobias. With that said, you should 'get serious' with a guy you like, and do it as an experiment and see how it goes. Just because you're dating doesn't mean you will lose your freedom and virginity. Do the flirting, find the right guy, and next time, just go one extra step. The more you will face the fear, and at some point hopefully you will have enough experience to get rid of that fear. Talking about it won't help much; action will go a long way.

My advice would be to just talk to the guy when you feel like your getting serious. Tell him what your feeling. If he likes you for you then he'll understand but if he never calls you again don't become insulted because he probably only wanted one thing. Remember this isn't a bad thing, a lot of people are scared of committing and most of them are guys so if your honest with them and yourself than things will work out eventually. Good luck!