I am afraid my boyfriend has the wrong impression of girls?

[Emma]

I am very self concious and always have been. I've been cheated on in the past and still to this day feel it was because I wasn't pretty enough or good enough. I am also very self concious about my body because I don't have big breasts or a big bum and the media and porn makes me feel like I need to look a certain way to be sexually attractive. I have considered labiaplasty, boob jobs and bum implants because I feel that bad about myself. I am tired of seeing guys posting pictures of girls like Michelle Keegan that have perfect bodies saying "wow" etc. because I feel that I need to look that way to be considered attractive. I feel disgusting.
Recently I found out that my boyfriend was looking at pictures of random naked girls taking photos of themselves on Twitter. It's not like he just came across them, he searched for them by typing "dirty teens" and "teen selfshots." I was disgusted and felt sick at what I was looking at, I tried to harm myself after I found out. It came to a shock to me that he was looking at girls in this way, because he's always seemed so innocent. I know it's natural but it just really hurts me, I still think about it and cry about it everyday and have done for 4 months. He also liked a 'Michelle Keegan' page on Facebook while we were together, but it wasn't the official one. It was only a profile of her in bikinis. I also read previous statuses from before we were together, and he wrote things like "I would ride Cheryl Cole into battle" and "Christina Ageuliera is better looking than Rihanna!". He also looked at girls profile pictures a lot on Facebook with big boobs (which I do not have), and they were all mostly bleach blonde (I have brown hair). He liked a page called "Curvy girls with big bums are better than skinny girls!" (I am really thin). I feel like I'm not his type, and that I would have to look like a porn star to feel that he was satisfied with me. I feel that disgusting about myself that I have contemplated suicide. I know I have a problem but I just don't know where to go from here. I am terrified I am not good enough for my boyfriend, I am terrified that he has the wrong impression on girls and that he thinks all girls need to look like pornstars. He has made me feel so ugly because of what I have saw him looking at etc. I just don't know what to do.