Well, lets put it this way:
I don't find myself sexy when I look in the mirror, however, it depends on my mood as well. I have days when i feel like I'm ugly and not good enough, and other days where I'm like checking myself in the mirror as if 'ohhh yeah, look who has it goin on....' Hahahah. But this is also very much depending on if I have no makeup on, am wearing a sexy or lazy shirt, and if I'm having a good or bad hair day. Improving your appearance does work to improve your self esteem.
I try to be neither negative nor positive about my thoughts about myself, but realistic. I try to like myself but also take into account what OTHERS think, because you have to deal with other people in life, and you want to make it as smooth a experience as possible, whenever you can.
Usually, the majority opinion wins, and I've been hit on by many guys I've been in contact with - usually online, but they've seen my picture. However I dont believe many of them have seen my full body, and thats the thing - they think I'm beautiful and sexy, but they dont see everything that I see. PLUS it doesn't help that I live in an area full of very slim and beautiful ladies, so usually that brings down my sex appeal thoughts, but when I'm home, after some guy has just been hitting on me online, up goes the self esteem once again.