Confused serious relationship question.

I've been in a relationship for almost a year now and I'm starting to feel like I don't want to be in it anymore.

I love her but I just feel like she loves me more than I love her and I don't know if I'm ready to be with the person I'm gonna be with for the rest of my life at age 16.

Sometimes I'm crazy about her and sometimes I'm not and I feel like if I broke up with her I'd regret it because what we have is really special and I thought I felt the same way she does.

There are so many other girls that like me and I'm all she has. If i left her she would have nothing. I don't know what to do.

I feel so comfortable with her but I don't know if its what's right. Am I just avoiding breaking up with her when Its bound to happen eventually?

I don't know what I want. If I broke her heart I'd feel like a monster. We've never had any problems in our relationship and its so perfect.