Mine goes back quite a bit when i was probably 11 or 12. On my mom's side of the family we're all very close and my grandparents have a beach house where we all stay on weekends during the summer. (It's a good sized house but between my family, aunts, uncles, cousins we add up to 20 in all so it's quite cramped and i have to share a room with 5 of my cousins and siblings) So we have an outdoor shower that we all use after getting home from the beach. I was using the shower and my cousins and little sister were all fucking around outside the door. (cousins are my age and 2 years older, sister is 2 years younger). I found a water gun inside the shower and decided that I'd fill it up and shoot them all when i got out. My stupid ass doesn't check to make sure my towel is tight enough around my waist and as i bust out of the shower BOOM. full frontal in front of my 2 (female) cousins and my little sister. Keep in mind this was at just the start of puberty and when i was most self-concious about my body. I gather myself and in the shock of the situation i stand there with a stupid ass grin on my face. I finally realize i should probably go inside so i did. This is where the 20 people in one house comes into play. There is no place to be alone in that house so i knew i would have to face them in about 20 minutes. They didn't really care but of course in my mind it was the biggest deal in the world. That's when my outgoing, funny personality i always showed to my family turned into the extremely shy, socially anxious personality i have around my family now. TL;DR showed my family my dick, now have social anxiety :) share your embarrassing moments!!