What's wrong with me

What's wrong with me?

I've gotten out of a pretty bad relationship two years ago.And i'm trying to get myself out there, but every time it's the same thing. I'll connect really well with somebody. But well, I'm excited at the start. I start getting this feeling in my stomach.And then I wanna end it i keep on comparing that person and giving myself reasons why they wouldn't work out. It's usually always with men i'm so nervous. I have a date this Sunday. And i'm worried, what if I don't like the guy, what if I have to call it off?What if he's mad at me. I hate the fact that I just can't love somebody without this horrible fear that they're not what I want . Maybe it's because I'm not over my other relationship. Or maybe it's just the people who I'm seeing. But this guy's like perfect, but i'm so nervous and feel awful. I think i'm so worried about finding the wrong person and being hurt again And then trapped in a relationship like I was with my last partner. I don't know I need some advice