Lost interest in every man

Ok a little back story to my "dating" life. I have had one long term relationship (HS sweethearts) and everything else over the past 4 years has been very short term dating (nothing over 3 months.) I am very social and have dated a wide variety of personality types, backgrounds, beliefs etc. no matter how open minded and non judgemental I try to force myself to be, it always inevitably happens that When I'm into a guy and we start seeing more of each other, I loose interest at the drop of a hat. They could be my "ideal" guy and all around great but for whatever reason unknown to me, I flip a switch and get instantly turned off and annoyed with their personality. At this point I'm questioning if maybe it's my fault and something I need to work through? I'm stuck in the mentality, though, that if it's meant to be it will be effortless in the beginning. My question is do you think we can subconsciously make ourselves turned off by someone because of some deep seated emotional issues ?? I'm at the point where I'm starting to feel guilty for not having an emotional connection with a guy like they do to me. Has anyone experienced this ??