Love my boyfriend, but not the sex

I have been with the same guy for three years and I do really love him, but lately I’ve been feeling a little trapped (I live at his house and don’t really have anywhere else to go even if we did break up). We never fight we have an awesome time together, but I almost fake every orgasm and sometimes stop him mid way through because I just get disgusted with sleeping with him. I have really bad self confidence issues to add on to it, if I see my stomach in the middle of sex that alone can make we want to stop. Either way, I can’t tell if I’m falling out of love with him or psyching myself out (giving myself a reason to feel trapped?) or maybe just bored with sex. We switch up positions but it’s the same routine each time. I am very interested in a lot of out of the ordinary stuff that I have no problem asking him if he’s willing to try —but I don’t have the self confidence to follow through. I hate my body. Tell me someone has felt this way before and how did their relationship end up :(