Is it possible to be naturally gifted at fighting or is it the way I grew up?

i have 4 older brothers who all have never lost a fight i have watched my brothers knock many people out growing up with ease but i am the youngest and somehow ended up the biggest and when we wrestle and fight i seem to always come out on top even when it has been a serious fight in the past also even in high school and in the street i have never lost and i wanna pursue a career in either boxing or mma and see how far i get cause i have even beat boxers in the past while i myself am untrained i was trained by my brothers and parents who grew up fighting also i came from a native American and irish background and my mother said that is what led to our culture growing up and fighting so often i have never lost and have asked people and they say i am just a natural fighter and probably good genetics is this true or am i just lucky i am 6’0 and 215 lbs at 17 i work out from time to time and do have a punching bag and weights but never have been to a gym myself or been trained would y’all agree i am gifted like i’ve been told or just lucky or is it just due to my upbringing

Is it possible to be naturally gifted at fighting or is it the way I grew up?
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