(I've already answered this in another one of your threads about the same topic.)
You probably have a retroverted uterus. It happens to 1 in 10 women, so it's quite common.
http://www.dyspareunia.org/html/retroverted_uterus.htm
Go to a doctor. Ask for hir (gender neutral!) to check and see if you're retroverted. If you're not, then you need to ask for advice/information from a
trained professional.