I'm scared to be in a relationship... But I'm in one.

I'm scared to be in a relationship...I had my heart broken really really bad this year. He distroyed my self esteem, self worth, motivation to try at all, made me fear I'm only going to ever be a fuck up, ect... And I'm dating this girl.. And she's my princess. She has scars and seems to understand where j come from. But I'm scared and I don't know what to do. I don't have a lot of friends... And I don't want to talk about this to them because they don't really say anything but "fuck (guy's name) he's not worth it" any advice?