Claire:

I don't wish to say what my body proportions are, but that said, I am also not 100% happy with my body either, and I often do feel a little fat. Its probably an extremely common thing that most women feel.
I have wished for a long time that my abdominal area could be totally flat, but somehow I think that is probably never going to happen. I'm pretty sure I have a body type that naturally resists that. So, in a way, I can empathize with you.
Especially since some men actually do call me "fat" as well.

As for your questions:

Are you attracted to or repelled by a fat person? - I am not usually completely repelled by fat people. I had two ex girlfriends who were fat, and truthfully, I have always found them both extremely beautiful. That said, I think I also have to agree that I usually am not attracted to fat men.

Are you attracted to or repelled by thin people? - I am almost never attracted
to thin people. Almost any time I see people who are thin, my first thought is almost always, "he/she needs to eat more, seriously."
And I can never personally relate to the thing of "just forgetting to eat." I actually met one really thin guy once who told me the reason he was so small was because he simply got so busy doing other things he wouldn't remember to eat. Seriously, if I "forget" one meal I feel like I want to tear someone's head off.

What body type attracts you the most? - Truthfully, what I usually like the most is people who are muscular.

How have my own body issues affected my love life/sex life? - I have had men make disparaging comments about my body size/shape while I am naked in bed with them. There were at least a couple of guys who took one look at my naked body and said, "wow, you need more muscle tone."
And there was one particular ex who saw me naked, and just flat out told me that I am "huge." (Which I don't agree with, BTW, but whatever.)