Is there something wrong with me?

I really like the idea of romance and dating. I think it sounds great to have someone there for you who gets you who can help fill those emotional and physical needs. I'm a sap for romantic movies. I've had some pretty serious crushes in my time. And I one day I would really like to have a family. In theory it is something that I very much want. But it seems that practically maybe not so much. Any guy I have ever gone out with has never lasted long. I always feel like they demand too much of my time and energy. At first I thought maybe I was just having bad luck in finding guys and that the ones I've gone out with in particular are clingy, but it seems to be more than a pattern and now I'm starting to question that. I've never gotten past three dates with a guy before I have decided he was just too much for me and then cut off contact even with guys I had been friends with before dating. Its not just that I find them annoying, but it actually just physically and emotionally drains me to the point where I no longer can see any good points. Any idea what could be going on or what I can do to find someone who I can handle being around enough to foster a relationship with?