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Could you turn a friend like that into a gf? Is it possible?
yes, but the real question is, can you turn a regular girl in most situations into a girlfriend? cause if the answer is no, and you don't try to sleep with girls regularily and have trouble showing your feelings
then probably the answer to your question is no, cause if you can't approach girls that you don't care about and try to sleep with them, then you can't approach girls that you care about and try to sleep with them, you will not have any idea of where you are going with it, you will just sit around hoping she does something when she is a girl, and if you've met a few girls you have probably realized it is more likely to be a cold day in hell before a girl makes something serious happen
you've known this girl for how long? you like her and yet you haven't tried anything cause you ''just sensed maybe she wasn't into it'', well fuck that, who cares what she's into, if you like a chick, go for it, you might get surprised and find out she likes you to, she might turn you down, who cares, not going for it is guarenteed failure it is 1000% more certain you will fail by not trying
grab your nuts and step to this girl like you mean it, if it isn't meant to be, who cares, at least you know for certain instead of living in regret years later thinking, WHAT ABOUT SUZY JIZZBURGER, SHE WAS SO CUTE, I WISH I KNEW IF SHE LIKED ME, IF ONLY... *SIGH*

, don't be that guy, do it for yourself so you can feel like you bossed the fuck out and did it your way, you didn't sit back in fear, you did what you felt like doing and it felt amazing no matter what happened as a result
GOOD LUCK