Well, from my experience, and what I’ve heard and real in a variety of radio shos and magizines (some of which are actually reputable) its very very common (read: vast majority, 75%+) for girls in the age range of under 21 years old to not be able to orgasm through intercourse. And a large portion of those girls are unable to climax in anyway outside of masturbation.
Now, being a guy, I can’t offer any firsthand knowledge of that, but I think its likely true. The justification for this ranges from ‘a girl becoming comfortable with sex being OK’ to ‘a girl learning how her body works, and learning to orgasm’.
Nevertheless its usually stated that a girl in a good relationship will move past this roadblock and become orgasmic with her partner, manually, orally and sexually. I suppose its possible that women for some biological reason just aren’t designed to orgasm right out of puberty like guys. Either way, as she ages her testosterone levels raise, and she becomes more horny and more orgasmic. I’m sure there are pyscological and emotional aspects to this as well, but the logic medically seems solid to me.
So all that aside, the wise advice is to just tell you that you shouldn’t be so goal oriented in you lovemaking. But, I’m also a guy and know that this logic is useless. As a young guy, your ability to make your girl feel satisfied, loved, and completely fulfilled means alot when you evaluate your security in your relationship. Its a tough thing to explain, but young guys fall hard for girls, and as such always feel very threatened. It this logic that explains why as guys get older, we become less jealous, less insecure, and less obsessed. Now, no matter how much you validate him, and how much you explain to him that he makes you very happy sexually and emotionally, his over active imagination is going to undermine it.
It doesn’t necessarily always have to be sexual, or physical, but theres usually something like this that makes a guy over analyze a relationship at a young age.
note:I am assuming that you two are relatively young, based on your complaint
Before I continue babbling, let me try and offer some useful advice. First, understand that this makes him feel vulnerable, and that the fact he cares so much indicates how much he really wants you to be happy. Knowing that, try not to get frustrated with him making a big deal out of it, when you probably don’t feel all that strongly about it. Respond by reassuring him, and try and do your best to assure him thats its common and not the fault of either of yours. It can, and will be fun to address the issue honestly, and when you actually reach a point where you’re able to come through sex (which you likely will one day) it will put a big smile on both your faces. Perhaps you could try discussing every aspect of sex openly, especially the ones which currently make you come, and see how you can merge them with intercourse. Chances are that if using a vibrator makes you come, and you begin using a toy while you and he have sex, eventually you be able to come with and without the vibe.
I can’t promise that you’ll one day be able to come from sex, but the fact you can;t now doesn’t necessarily mean you never will.
To answer your question, it could be a physical problem, psychological, or just the way your made. Any or all three of them. Could it be that you’re not secure enough in your body to allow yourself to come…sure. Could you not completely love you boyfriend and that is inhibiting you ability to let go…certainly. Could you be afraid of the extra intamacy that sex brings, compared to fingering and oral sex…very likely. If its any of those, there is no quick fix and you’ll both just have to be patient and wait until adulthood completely latches in. But you will move past it eventually. Could your clit be to far away from the thrusting and friction of his body during sex to allow you to come just from intercourse…yes. To fix this, you’ll just need to learn how to incorporate manual or additionall stimulation to it during sex. This just takes practice and lots of open discussion. Could you simply be made to not be able to come this way…unlikely, but possible. There is certainly the chance that you simply are one of those women who will never be able to come this way. But I doubt it.
Just talk it out, and I think you’ll discover that this is not nearly as big a problem as it seems, but just remember to be honest about it.