Its because we aren't exposed to it growing uo, my cadaan friend said that her parents occasionally let her have a sip of their wine glasses when she was younger.
The only reason why I was being overly cautious was a cause I still live with my parents and didn't want to get caught. Best believe I hit up Google like

before my first time to avoid the daqan celis lmaooo. I followed all the steps and everything

made sure I ate before I went, paced myself etc.
I think it also depends on your company. Lbr some ppl are not good friends lol especially when they let you act a fool. At least I had a decent couple of folks around to tell me what to expect. There was this one guy who kept encouraging me to take shots even tho I told him it was my first time drinking

the others gave him a right telling off