Hi Kal what you could try is some jelqing, its the way this exercise works, this could help to reshape your p***s back up or should say recurve it upwards, as this is the way most men have sex, or you will be forced to do it the other way round for comfort, look just go to pegym, on there look for the beginners page, when it comes up or the right you will see beginners, when you go into an exercise hit on the word exercise, and when it come up scroll down.
Good luck
If one masturbates lying down, fact downward, this type of shape may be there.This position puts pressure on the base of the penis.Better position for masturbation is face up, lying supine.You will be able to do intercourse by adopting a suitable pose during intercourse. Probably a doggy position will help.