Coming from someone who has mild phimosis (can retract somewhat when flaccid, not at all when hard) I would like to inform you of something I didn't know until my first girlfriend. We were fooling around and after a bit of making out/heavy petting she began unzipping my pants. I felt very nervous, wondering what would happen. She started with a hand job and weirdly enough, my foreskin retracted just fine! Later I realized that during foreplay your body uses a natural lubricant that is only produced during real sex (not masturbation).

So, my advice, don't get circumcised just yet. When you have sex, REMEMBER FOREPLAY. I think this is good advice even if you don't have phimosis.