<human>: Okay so some back ground I am a senior in high school and she graduated a year ago, we have broken up three or four times for about a week at the time and gotten back together; (not even technically broken up we were still sleeping with each other) this is my first real relationship where I can say I am truly in love however...

Things with us are not the same it is like we argue all the time now. 
It is truly the first relationship that I love someone but this isn't her first one. It is not a turn off but I don't know if she is the person i truly want because she is all I know. Also it is my senior year and I kinda want to have some freedom, and not be tied down. I know this sounds kinda wrong but I mean I want to be able to experience my life I don't want to be tied down she has started to talk about marriage and kids and I don't think I am ready for all that. I have also been kinda talking to other girl that I think I might like but not sure yet and if I do I can't go through with it.

Mainly my question is am I being selfish? Should I break up with her? If so how do I do it and not go running back to her like always?

Give me a shortened version of the text
<bot>: Me and my girlfriend have been together for a year and a half and things aren't the same. I want to try other thing and am I being selfish for thinking this?