true... I sometimes wish i met her in a later stage of my life!
And of course i know you can't exacly tell me what to do

i'd be a fool if i just did whatever someone wrote me on a forum to do with my 4 years of relationship. But still i'm trying to find anyone who can understand the things i'm feeling. Maybe give some advise on how they handeled it.
I appreciate your opinion. I think you did hit the right snare on the I jumped into something serious too fast. I'm currently 21.
Yeah, I see what you mean, 21 is very young to have already been in a relationship with someone for four years, but that's all depending on you personally. Some people don't ever really desire experiencing that "single life" of parties, hooking up, casual dating, seeing what's out there, etc etc. I haven't partied very much in my lifetime, I fooled around a lot and made a lot of bad decisions, because of some of that I feel like the things I desire from a relationship now, as I'm 22, are things I should be looking for in a relationship years from now, maybe 25+, like I sped up my life from all of the stupid mini cooper I did lol.
However, if you DO want to experience the single life, and that doesn't necessarily have to be any of the things I mentioned, it's whatever you make of it, then you really have to think about what you want to do with that girlfriend. Do you think there's any way to get what you want out of the "single life" while still being with her? Some couples go to tons of parties together, drink, go to clubs every weekend, etc etc, and it fulfills what they want out of the single life while still in a relationship with their partner, BUT, if one of the things you're looking to do is casual dating, maybe even hooking up (just as an example, not saying that's what you wanna do haha), then I mean, of course it's not my place to tell you you should break up with your girlfriend, but yeah, you should probably start to really think about the possibility.
It's just the whole idea of figuring out where, if at all, your girlfriend fits in with your lifestyle, and the lifestyle you want to pursue.