Oddly enough, it was the opposite for me. I used to be highly introverted because I didnt know anything about 'girl' culture, and I couldnt hang out with the guys as much because opposite sexes tend to attract, its not the same as a simple friendship. My friendships with girls where we ended up playing Id always add fantastical or other elements that more suited my tastes. I never played as the girls did very much. For that reason I was always very much alone and introverted, an anomaly.
Nowadays I find myself melding with guy culture, if I spent the day with a huge group of stereotypical guys Id probably be slightly lost, but in my older life I hung out with a mixed group of friends, a lot of them male, and it was the perfect blend.
Remember to imitate tone and words a lot, I started saying "dude, man, bro" a lot. A lot of parting greetings are things like "Thanks buddy, thanks man, take it easy", you'll be surprised how much an accurately placed "male" word is when placed in speech. The way you walk, stand, and sit is also a big tell...it might take practice to resocialize these, for example with me as a kid I used to sit with leg on knee and a kid told me "my dad sits like that", I was confused but I stopped doing that. I ended up doing the feminine crossing my legs for years. When I realized I was transgender I started going back to the old posture, the weirdest thing is it started out physically uncomfortable, which was odd! But after doing it awhile it started to feel comfortable and natural. So in the end, learning how to be male takes a bit of habit forming. Study the males around you and make an effort to be that way, it may not be easy at first but in time it comes natural
