To much of a good thing, is bad

I have high self-esteem. I expect everyone to like me and/or be attractred to me. When they don't, it's because they have the wrong impression of me or soemthing, so I avoid them. I think I'm flawless. And it's my percieved flawlessness that is my flaw. And now I'm feeling disgusted by myself.
But I haven't always been this way. In high school I wasn't that well liked; though some of the people who truly knew me told me I was special and that I have a lot to give. This built my confidence and self-esteem. This view of myself in relation to others, is also what i think, in some ways has contributed to me not being in a relationship.
Also, today i met a guy who was very straightforward and blunt, in telling me that he thinks I'm hot and that he wants to kiss me. I would have and should have, but felt that it would be taking things to quick. And I know that a good kiss can often lead to other things..And moving beyond this would make things complicated for him. so i withheld. A little while before this happened, and elderly man told me that if he had as many people interested in me as I did, he'd be trying each one of them, giving them a chance. This made me feel guilty...that there have been a number of individuals who have liked me, but have not had the feeling reciprocated. To put this in perspective, I just found out today, that a past lover/potenital is seeing someone who goes to my old high school. the guy he's seeing is really nice though. But this makes me wonder. It made me sick thinking about it.