Is it possible to penetrate the cervix?

I've read some other questions on here about men hitting the cervix with their penis and that the penis doesn't go through the cervix. I'm larger than average and my girlfriend is telling me that I'm actually going through the cervix. When we first started having sex it was very painful for her because she thought that I was penetrating the cervix. Now she's past it being painful but still thinks that I'm actually penetrating the cervix. My question is, is that possible?


Should I explore my sexuality?

I'm about to enter college and female, and, just recently, I've been attracted to a few girls. I also get aroused when I see two women having sex or kissing. I've had three boyfriends in high school, and I think I am still attracted to men. I would really like to experiment with girls to see if I am a lesbian or a bisexual. What should I do?