Relationships - help

I can't feel anything. I've built so many walls around me that I just don't let anyone in, not even my family. And that hurts, a lot actually. I know it's wrong but it has become a habit and although it hurts, I am too scared to actually change that. I was in a serious relationship a couple of years ago and it ended badly (at least for me). After a while he started dating an old friend of mine (that's not the point though). It's just that he was my first serious ''thing'' and after that I haven't done anything serious with anyone (pretty much). And I keep wondering what I am doing wrong. I don't know if that's the case but I recently thought that maybe it's to do with all these walls. But I still don't get it. I hope I don't sound too crazy and that there are people out there that can give me a good advice and maybe relate to it. Thanks :)

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