This happened a long time ago (a decade) but... 

I like animals,  dogs in particular so when I was 19 I signed up to volunteer at the humane society. Something to do when I was off and help animals. So I had to do a volunteer orientation. Something I should mention is I look young for my age,  even now I'm almost 30 and still get carded.  

So I go to orientation and sit down, I'm by myself because I was 19.  Then the volunteer director was in the front of the room and looks at me and says "are your parents here?"  I said no, she said "well since you're a minor you need your parents to be here". 

Everyone is looking at me. I was like "I'm 19..."  she just said oh, and went on with it. 

It bothered me the entire orientation, I felt like I did something wrong even though I didn't.  She embarrassed me too. I think there were better ways to ask besides calling me out in front of everyone and forcing me to announce my age to 20-30 people I've never met.  I wanted to walk out right then, but figured that would make it look like I wasn't really old enough to be there and lied. I stayed through orientation but at the end of it when we were supposed to sign up for jobs I just left.  She emailed me a few times but I ignored her. 

So now when people learn how much I like dogs they're  like "you should volunteer at the humane society " I say "no" and tell them the story.   They say "let it go" or "she was just asking " "it's not a big deal ". To me it is. 

This was before I was diagnosed with anxiety but looking back it was pretty obvious.