Why am I having pain during intercourse?

[Kittyxboo]

To start with some background information: I lost my virginity at 17 and only had pain the first two or three times having sex and every other time was perfectly fine. After that relationship ended I didn't have sex for 3 years until I got into a new relationship, my current relationship. I am now 21 years old. We tried to have sex and of course it was painful seeing as I didn't have sex for three years and this new partner was larger than the previous. After a few more times of painful sex I went to my gyno who a swab and found a slight yeast infection but got rid of it and the pain continued. I was worried about endometriosis because it runs in my family so I had my first PAP test done and it came back completely clear. Though while the PAP was being done I felt some of the pain I felt during sex just less of it. The doctor recommended lube so we tried a couple different kinds which just seemed to make things sticky and more painful.

The pain I feel is mostly during insertion which I would describe as a strong burning and friction feeling. Sometimes I feel his penis catch on something, or maybe almost fall out I don't know. He can't go deep at all because I feel a sharp deep pain. One time he mistakenly went too deep and I felt a horrible sharp pain which I'm guessing is him hitting my cervix?

Also, when he "finishes" I can't feel it, whereas I used to be able to with my first partner. Sometimes afterwards I bleed and most of the time I feel a burning around and inside the opening of my vagina.

I just don't understand why I can't have sex without pain anymore and would like some opinions? Also, sometimes it doesn't hurt as much as it usually does. And we also found that if I orgasm and he keeps going it hurts much much more.

Sorry this was so long. Thanks for any possible answers.