I had a problem like this and went to my gyno and told her. She checked me out and said I had a uterus infection, and prescribed me antibiotics.
Get a gyno; that's my suggestion. There's only so much you're family doctor can do with your downstairs.
Yeah, it really sucked though. Sorry bout that, honey.

I have that problem myself actually. Any partner that I've been with (all three of them) have caused me pain in certain positions, the same one as yours. Tho sometimes even the regular missionary can cause me pain. What it is could possibly be an infection but it could be that in those positions, your partner is hitting your wall and that's what's causing the pain. Try placing pillows under your stomach and hips in some positions. That helps me out with my partner. I don't have a gyno either (can't afford it) but it helps for me. And make sure you communicate with your partner too. Let him know that some positions can hurt you or let him know if his usual movements can hurt.

My partner is rather big, so he can't go too fast and hard because it'll seriously hurt. But he's careful because of it. But that's my advice

I have a similar issue. I have an exposed cervix, its just means the lining between my vagina and my womb is thin so alot of my cervix is exposed. It didn't appear when I was first having sex just in the past 3 years. Unfortunately there is nothing that can be done apart from just being careful.
What could help, if you have what I have or not, is when you do the positions that are uncomfortable to just lean forward or make sure your guy isn't pointing too far forward or to the front of your body. e.g. if you do doggie, press your head against the bed with your bum in the air, or if your on top, lean down slighty, hold his hands for support.
Either way it's best go for a doctors appointment (or nurse if you have a male doctor like me) just to check yourself out.

Sweetie when you do it doggystyle or if you are top, that causes the penetration to be deeper so that's probably why you are hurting, i've been with my boyfriend for two years and even before him i had sex alot, so let's just say i'm really experienced. And i even still hurt sometimes. It's natural.

I have this problem too. I had it very badly with my first serious partner; we only tried to have sex three times in almost two years and every time was agony ¬¬ . Next sexual partner had a pretty small member tbh so nothing much there (as in, no pain, but tbh, not much else either, lawl). Now, with my current bf, it hurts a little almost everytime we have sex; it generally wears off after a few minutes tho. Either it's his size, or I might have a little bit of vaginismus as I have (now mild, used to be crippling) anxiety problems to begin with. I find it hurts most when I'm on the bottom actually :/ but I have a skin condition down there that makes me very dry which doesnt help. Go see a doctor, as long as they're nothing like mine they'll help; I was burning dusring sex at one point, INCREDIBLY painful, and the doctors misdiagnosed me with thrush, chucking treatments at me for 4 months... I didn't have sex during that time, in fact I couldn't, which frustrated my partner quite a bit :/. Eventually (more like finally) I got referred to a gyno who did some (v. painful) swabs and found that it wasn't recurring thrush; it was an unknown mild infection with a proteus infection on top (proteus is basically thrush but with a different bacterium so thrush treatments actually make it worse). I had 2 different antibiotics which made me puke horribly when taken together('oh yeah, you can take both of these at once'... ¬¬), but after that, I was fine. Still get slight pain though. But meh, I can live with it! It's starting to improve now anyways so I think I just tense up sometimes...

dude. the only time sex ever hurt me was when i was pregnant. because things get shuffled around down there when youre pregnant. go to the doctor.

If you're sexually active and/or over 18 years old, it's highly recommended that you see a gyno regularly. Sex isn't supposed to hurt that much. Go see a gynecologist.

Sex always hurts me. Iv been checked multiple times by doctors and they can't find anything. Mostly it hurts when we use a bad position and it rubs agains the edge in one area to much or stretches to much in one direction. Sometimes it's because he take a very long time to finish and the friction begins to hurt and sometimes it's because I'm to dry. Have you tried using lubrication. It may make it easier.