It is weird I don't enjoy being I relationships?

Ali
Hi so I'm a junior in high school and all my friends have boyfriends and such and I've had guys like me and I have crushes on guys but I don't feel comfortable in relationships. I don't know how to explain it but I just feel so trapped and like I'm on a leash. Maybe it's because I don't feel like I can commit to one person but I don't know. Maybe I just haven't found the guy for me yet but it's frustrating because I like some guys but I realize that even if I make a move on them or something that I would have the same outcome with previous guys and just run away from it after a month. I'm not sure what I can do about this but I really hate this about me. Part of my problem might be because when ever I dated a guy before I still had crushes for other guys.  Ah I don't know anymore, I don't even know what I'm asking for posting it here I just wanted to know if anyone is on the same boat as me or if anyone knows anything I can do to fix this predicament of mine.   
Sorry it's a bit long but if you read through this thanks (:  

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