I've been with my girlfriend for nearly six months now. I've always had a bit of a problem having sex with people (keeping it up) but this problem has never occurred between me and her. However, lately I've begun to feel very guilty about the physical action of having sex. The act of penetration is a great experience physically, but when I think about what I'm doing I feel like I'm stabbing her, or performing some kind of violent act on her. We haven't had sex yet since I started REALLY feeling like this (which was a little more than three weeks ago) but if we are making out and begin to have dry sex I often start to cry from the idea of what I am doing to her. She's very compassionate and understanding, and I have told her all of this, but I want it to stop. I need to know how to make myself stop feeling like I am abusing her when we have sex because considering the times we've had sex before I had this mindset, it's been an incredible experience of expressing our love to each other, and I'd really like to have that back.

I was at my boyfriend’s house a couple days ago and his parents left to bring his nephew to a race car show or something like that. While they were gone, we decided to have intercourse. His mother walked in the house to find us in his bed having sex. I was so embarrassed; I put my clothes on and just laid there. I didn't say one word after that, I just kind of sat on the floor and cried. I called to get a ride home immediately but now I'm scared she's going to tell my grandmother who is my guardian and I can tell her myself. I want to know how I should tell my grandmother I'm sexually active and if I should write a letter to his mother apologizing. I feel she might hate me now. I don't know what to do...