Sex: How did it hurt?

Sky
Hey girls! 
So my boyfriend and I tried having sex for the first time but we stopped because I was a little uncomfortable. I wasn't sure if what I was feeling was the right feeling. It wasn't him it was me. But when he tried to put it in it was a pinching feeling. Is that what it's supposed to feel like? It was my first time so I kinda freaked out internally. I can't talk to my mom about this kinda thing so I am turning to you guys. (I'm 18). Thanks!