<human>: Could you distill the essence of the text into 1-3 sentences?

I doubt many will respond to this, but I come to Reddit because you guys can offer me advice Google results can't. 

I've been having sex about four years, with 12 different partners so far. I'm female. Of the 12 I've had: a relationship with one, semi-relationship with one, the rest > fuckbuddies /one night stands (mostly the latter).

I've only had two enjoyable experiences (1 in semi-relationship, 1 one-night stand). On the scale of pleasure it's more *"eh, better than nothing going in and outta there"* than *"oh baby, oh baby".* 

With the open relationship we had sex everywhere, all the time. Did the dirty talk, the S&M, and all that. The dirty talk was amazing for me, but it seems like I have a cap on how much pleasure I'll allow myself to feel. Once he tried a new technique and it was like nothing I'd ever felt before; glorious. I made him stop.

I can't masturbate, I just can't bring myself to do it. Porn will turn me on till I get to the point where I want to whack off and then I shut off. I feel dirty, even. 

I can't take off my shirt during sex, I feel awkward when a man is touching my stomach. I feel like I can't compare. I'm 5'9 and 125 pounds - if I was to think rationally I'd know that that is by no means overweight. But I just feel like a giant gummy bear. I truly think that if anyone ever saw me naked they would be horrified.

I need help. I know this doesn't seem the most dire of circumstances but I feel like something is wrong with me, and I feel like I'm going to burst. I'm constantly turned-on, and it's **all** I think about, it's even been seeping into my dreams lately (they're of me masturbating). It's affecting my work life as I can't concentrate... and I'm tired of seeking one-night stands in hopes of relieving myself. Thanks for reading this far.
<bot>: I stop myself from feeling too much pleasure during sex. I can't masturbate as I feel dirty. I have body issues like every other woman on the planet. Advice?