Can't be in a relationship??

Anon, I use this site quite regularly and its quite embarrassing. I can't be in a relationship, I genuinely can't do it. I enjoy the initial stages of getting into a relationship - The chase, the banter/flirting etc but suddenly when things start to get serious I shut down? Seriously, I think I'm emotionally challenged. Its almost as if I get bored of the situation and start to back off, I've never been able to stay in a relationship for more than 3 months and I've never had any particularly bad experiences that can be to blame for me not being able to be in a relationship. I feel like there is something wrong with me. Its not that I don't want to get a boyfriend and settle down, because I really do - I just can't, I reject all forms of relationships I don't even let them develop into anything serious. I'm 21 this year and I don't want to be a crazy cat lady (not to mention that I don't even like cats) but I can't see myself settling down and it scares me, it really really scares me. Anyone been in the same situation, or know why I'm like this? Or how I can stop being like this? :/ Its really getting to me.

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