Re: Is it my head?
It may be something psycological but I suspect it is related to the difference between your masturbation and her vagina. You see, our penis becomes "trained" to respond to our masturbation habit...grip, speed, technique, style and all that sorta stuff. Then when we become sexually active it takes some time for it to respond to the vagina...looser fit, different everything. So, don't worry and keep working at it. This is a common problem and one that can be resolved.