this may work for u. try a spooning position (on ur side), use plenty of lube and relax. have your partner go in very gently and slowly just a little bit and hold it. he can kiss your neck or play with your breasts to get you stimulated and get ur mind off of that so that you can relax a bit more. when you feel more relaxed have him withdraw, not all the way and go in again this time a little further. as you continue you may learn how to relax and take more in. once you have succeeded complete penetration. a few sessions like this may help you get ready to try different positions, but this one for some reason takes the pressure off and helps get you going! :) idk, the vibrator might work too, but the way I described, I think, is way better.