I feel she's holding me back, help?

I've been dating my girlfriend for a bit more than three years (since senior year in HS, I'm 2nd year college now) the thing is that she's awesome and sweet and the nicest girl ever but ever since we began re-dating (we had been going out before for a couple months then broke up) I have slowly lost contact with many of my friends, I have come to realize that I tell her what I'm doing all the time and if I don't she calls me to ask me what I'm up to, but in such a nice way that it doesn't seem bad. There are times we hang out and say nothing to each other for what seems eternities. I sometimes feel she's there just to be there, like it makes me feel controlled but in a very sneaky way. I really want to meet new people and have adventures in other cities or places, but she's not like that and she gets really jealous even if she doesn't show it. We've had rough times when we are on the brink of breaking up and we both know that the next words out of our mouths should be "this isn't working out anymore" but somehow we never get to them. Maybe because we have become such close friends...but its weird. I don't want to loose her as a friend, but I have no idea what to do with the relationship situation. It gets pretty tough. ...any advice or Help?
I feel she's holding me back, help?
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