do all people act normal naturally, or they just act normal?

like do they go "i should do this ritual to appear normal", or they just do that thing normally?

irl, i realize many people act or react like they are following a script, they dont think about what they are doing or it helps them achieve their current goal. they just follow a script.

im gonna exaggerate but, its almost like the script tells them to scratch their head when they feel hungry, to not feel hungry. they will do it.

also not to cause misunderstandings, i understand that cultures are solutions to problems we forgot about because the culture eliminated the problem. but im not talking about the culture im talking about how people act daily, for example while walking, cleaning, shopping, chatting.