Judgemental, Cautious or both?

I just recently bought some beer at the local grocery store. So how come i get dirty looks from other customers when i buy alcohol? They give me this look like I’m doing something very, verywrong by buying alcohol. I’m cool with them being cautious because i do have a baby face so its understandable why some might be concerned. However that isn’t my problem. As a matter of fact I’m a cashier at a grocery store too and i card baby-faced people like myself all the time just to be safe. My problem is that society often assumes everyone who drinks is up to no good. My uncle was a drunk who would get out of control and beat up his wife. I’m no alcoholic but i do drink every now and then. I am naturally a friendly guy. When i drink i actually become even more friendly and nice. So not every drunk becomes aggressive or stupid. But i am insecure about buying beer because i get looks from people who may or may not be thinking I’m some bad guy just cuz i bought alcohol. I sometimes feel like when i buy beer people look at me like I’m some monster or some Evil Person like Darth Vader or something. Like i said I’m not mad for being baby-faced. I’m just insecure about the attention i may or may not be attracting. I know this could all be in my head which is why i say “i may or may not be” getting judged so harshly. People often tell me to drink responsibly yet the very same people who tell me this or to “be careful” are the ones getting out of control not me. I get silly and start joking around but i don’t go around trying to pick fights or try flying off a cliff. I just drink to take the edge off a little. Or sometimes i have a stressful day at work and i like to drink 1 or 2 while watering my grass or while I’m watching t.v..