Anyone else?

hey so like this may or may not be tmi but like i naturally as a kid had like arm hair and leg hair, etc but like not armpit hair or down there hair (well like duh..i was a child, not now obv) but then puberty came and i eventually grew armpit hair and down there hair but like does anyone else question why tho?? like i get that it is a sign of sexual maturity and to trap bacteria from getting in ur inner sensitive parts but like what abt when i was like younger and had no hair, what kept the bacteria from entering?? anyways i usually just shave my armpit hair off like monthly and i gave up on shaving down there..and just trim when its too long for my liking. i solely do this not because i want to feel hygienic because u can have body hair and still be hygienic but i find it annoying for some reason..i stretched this topic out wayyy to much so srry for that