Both Howard and Mikayla have good points here. Practice makes perfect, so play play play with your bf and get comfortable with your sexuality. You've only just started to have sex, and you should expect a lifetime of learning ahead of you. One thing I can add about the pain is that a lot of foreplay and being fully stimulated before actually beginning intercourse can really help you. When you are sexually stimulated, your vagina will stretch and dilate on its own to accomodate a penis. Not having enough foreplay can be one reason it still causes you pain during sex. At least show your bf our posts so you can get more oral time! Secondly, experiencing too much stress or not being 100% comfortable with the sexual contact mentally can cause you to "close up". After all, the vagina is surrounded by muscles, and how easily do we get back and neck pains from stress alone? Women's sexuality is complex, and feeling external pressures about sex and other things can easily affect our bodies. For another thing, your hymen may still be partially intact. Although it's probably been broken through having sex and just by aging, going on what I've read there can still be parts of it intact. Time and further sexual contact will make sure it actually is broken and fully eroded, and a doctor's visit will tell you more about that. All in all, you should take some time to talk about this with your OBGYN and her expert inspection will help give you some answers.