^ it's definitely true that culture matters. for example, i'm dutch myself and have hung around a lot of italians, and it's very normal for them to be physical (hugging, kissing on cheeks) while we dutch are generally a lot more "distant" / reserved.
nurture plays a huge factor, including culture, family, school, hobbies/sports..
nature of course matters a great deal as well, and there's no way around your personality.
anyway, maybe you just had a certain click that you "need" to have an easy time feeling comfortable with being physical.
for reference, i grew up with 2 very different families. my father's side is way introvert, while my mother her side is very much physical and emotional / extrovert. i grew up playing football(soccer) where being physical is very normal, and was always surrounded by friends who were a lot more physical than i was.
now, i definitely have the introvert bit that my father's side has in me, but (i guess) because of my youth, as well as the bit that i got from my mother, there's a strong familiarity with physicality.
meaning, i'm definitely no stranger to it, but can also definitely feel uncomfortable by it.
maybe (the subconscious of) an "introvert" just has higher demands when it comes to caring to be close(r) to someone? imo it's not a bad thing, because it makes contact more valuable.
( just ignore if this is not what you meant
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