I am a college-age guy and in a relationship with a girl. Basically, we were kinda unstably together for 8 months or so, but now we have been in a real relationship for a month.

The first time I masturbated was less than two years ago. I got into the habit of masturbating to pictures on facebook because I found porn gross, and I continued to do this until about two months ago. I feel absolutely horrible about it. It's a gross habit and it's objectifying and I feel just gross. I feel like a disgusting horrible pig, and I feel like I am being dishonest with my girlfriend by not telling her because I feel like I am lying about who I am or something...she knows I masturbate regularly, and she knows that I used to think about other people when I masturbated sometimes, which she thinks is totally normal. What she doesn't know is that I used pictures on facebook...do I owe it to her to confess these past habits to her? We weren't in a real committed relationship during the time I did this, but we were together and we were exclusive....I just feel so so bad.....she's the first girl I've ever been with or even kissed and I don't want to ruin anything