Advice about alcohol and 21st b-day.

I just turned 20 in December, so my next birthday is my 21st and i want to be prepared for it. I’ve never drank before because i genuinely have just had zero interest, but for my 21st Birthday my mom wants to take me to the bar in town. I don’t like social settings. I don’t like being flirted with. I don’t like people who smell bad. I don’t like being impaired in any way (ESPECIALLY in public). I don’t like how alcohol smells. I don’t like loud noises. I don’t like attention. I don’t like any of what going to a bar on my birthday entails, but i love my mom and i know she really wants me to have fun.

I know it’s silly, but does anyone have advice or important info about drinking or going to a bar? Anything you would have told yourself? It’s not for a whole year but i’m so anxious.