feeling trapped with my girlfriend

Right I’m kinda out of sorts at the moment for a few reasons, you see all through my teen years I was really overweight and greasy haired and spotty and had absolutely no luck what so ever with girls then I lost most of the weight and I got a bit better looking and only in the past 2/3 years have I been able to get girls, and I’ve spent most of that time in serious relationships also i spent my teens living with overbearing parents and only a few years ago did i move out and gain independence and i love it.

Now after I broke up with my last girlfriend (amicably) I decided to stay single then I met my current girlfriend and I couldn’t help myself, I mean she was everything I ever wanted in a girl and by some weird brain disease she was mad about me too 'cept she's had a very conservative up bringing and has never really done anything out of the ordinary,
Thing is the thing she loved about me is that I was this adventurous crazy guy which I only was because I had the freedom to be myself, now me being myself is pretty crazy I tend to do stupid stuff a lot for fun which scares the crap out of her and I mean I know I'm a mature responsible 24 year old guy and I know my limits and I know what I'm doing but that just doesn’t wash with her
and the more I stay with her the more I find myself losing what it was that she liked about me,

it’s kinda wrecking my head because you see I love her to pieces but I feel I'm compromising a lot of who I am to be with her which I wouldn’t mind if id lived a bit but I haven’t. I want to get out there and see what’s going on. Basically the problem is. If I stay with her ill have major resentment that I can’t do what I want and if I leave her I know ill regret it

i can always get my **** together with a job/house/kids etc when I'm older but ill never get my youth back
and also i love this girl and i think if we stay together we'll wind up making each other unhappy.