discomfort

I recently lost my virginity to my boyfriend of almost five months. We had sex today, and he got me into a position where I had my legs up??

so they were sort of on his shoulders while he was fucking me yknow - similar to missionary except my legs werent down. It didn't feel good the second time. I felt like his dick was hitting my uterus, so I stopped him halfway through so I could go and pee. went to pee, came back and continued in the same position, thinking "this is going to be fine!"

it felt EVEN WORSE. what in the hell!!! just wondering if this position hurts anybody else?