What am I doing wrong?

I'm a fun girl. I am not super outgoing, but I'm not shy either. It seems though like I intimidate guys. I am over friendly and usually talk a lot and open up to guys pretty quickly. I also say some stupid stuff sometimes (to me I think it's fine but the guys I like seem to get intimidated and back away). A lot of them show all of the signs then when I make a subtle move they seem to start backing away. I'm friendly, I flirt, I'm not fat but not skinny either, I'm not ugly, I have good hygiene etc. I've had five or six boyfriends in my lifetime but they were all only after sex and didn't treat me with any respect. All except one dumped me. I just want to know, what am I doing wrong? All the guys I like or can see myself with (nicelooking, funny, and just respectable guys) avoid me and don't seem to really want anything to do with me. It always seems like the only ones interested are creepers. Guys and girls, what's your take on this?