A big issue with going out in public with me has always been the constant worry of others' opinions. Wondering what people are thinking, believing they are thinking the worst and constantly judging me
whether aloud or not.

I've tried to limit myself as far as running errands, buying groceries, etc. in fearof actually running into a situation where I'm put down verbally.

As far back as I can remember, I've always had a similar demeanor. People
think I look upset/mad/pissed off all the time, regardless if I am or not.
This seems to have gotten worse, from all the SSRI and mood stabilizers I've been on for 13 years now. I've always been extremely quiet and wanted to mind my own business and go about my day.
I've been called out alot by people because of this. Mostly sarcastic comments like "Boy, you look thrilled!" or "Smile, it won't kill you." To a certain point, I've gotten used to that. It is still extremely hurtful.

Yesterday I had to go out for groceries. I waited patiently in line, and as I sat my merchandise on the counter, the cashier started in right away with comments. "God! You look SO happy to be here today!" (in a completely loud, sarcastic way). There were other customers behind me in line,
so I just shook my head a little and looked down at the ground. The cashier then felt the need to comment further. "Is it just one of those days?!?" I responded, "It always is."

I was pretty upset at that point, and had hoped to just finish the transaction as
quickly as possible and get the hell out of the store. Then he commented further...
"Isn't a black shirt with a turtleneck kind of inappropriate for this time of year?"
I really was at a loss for words/thoughts on this.
I was trying to justify in my mind how some low-rent cashier had the right to comment on my demeanor, let alone my clothing!
Generally, I get the usual "how are you doing today?" And I tend to respond with "Fine/good, how are you?"
As difficult as it is for me to speak in public, I always have the courtesy to respond back. However, I couldn't deal with this guy. Finally, once he was going to hand me the receipt, he says "Well, hope the rest of your day isn't 'one of those days' and maybe next time you'll
dress more weather appropriate."

All I could do was cry on the way out of the store. I came home, didn't want to tell my husband what happened, but he pried it out of me. He called the store manager, who said the cashier in question "probably would have never said anything like that" and that he would "talk to him about it"
this morning. I somehow doubt this would even happen, and feel like there's something more I should do about it.

Has anyone else had any similar problems? How do you deal with them?