I don't love anyone anymore.. is it normal?

I ended up enrolling in a different high-school my Junior year. I left many of my friends because I didn't want to feel anything for her ever again. Finally, now, I'm over her. I'm really done with her. I'll occasionally see her and I know for a fact that I really am done with her. I finally phased through the step I hadn't passed before. She had played with my feelings and emotions for the last time. I was relieved. It's been a while now, and I've tried having relationships with different girls.. and I've noticed something's wrong with me. I feel like I can't love anymore. I find girls attractive still, but not in the same way. They can be hot as ever, and cool as can be, but I don't have those same feelings for them. She must have really messed with my head/emotions. I can't see myself being happy with anyone. I've had several girls express their feelings towards me, but I let them know I don't feel the same. My family and close friends have noted that I seem depressed. I don't know what to do, but I'm longing to feel those feelings. I've tried opening my heart to relationships, and I just have literally no feelings of love for the girl(s). I have plety of hobbies, and I have plenty of friends. I feel fairly happy, but there's a void I'm desperately trying to fill. And it seems impossible to be filled. I use to always have one/some of those "dream-girls" in my mind, whether real or fantasy, but now I don't have a single one. It now feels like all girls are mere toys and distractions, and not something I can actually fall in love with. I find it sickening that I even feel that way. I want to love, but I just don't feel that it's possible. It's been close to a year now, and I've yet to feel feelings for anyone. Maybe everyone feels this way at one point in their life, I'm not sure..

Is this experience normal? Whether it is or not, how should I proceed? Please, help..