How embarrassing is this?

I'm 18 right now and I remember when I was 15-16 years old or so I started to take swimming lessons at YMCA. I realized on my first day of lessons that the others that were there were all kids (7-10 years old). There was a pretty cute male instructor and a female instructor that kind of kept her distance from me and kept giving me glares (probably because the male instructor thought I was cute and kept smiling at me). Anyways, on the first day we were doing this exercise where we had to jump into the water and I was terrified. When I did it, it wasn't so bad and after I sat at the corner of the swimming pool. Everybody kept giving me these awkward glares and this woman came up to me and asked if I can get her child's goggles from the bottom of the pool. Even though I was terrified, I got it for her but she didn't even say "thank you" and glanced away from me like she was ashamed of me. I went back to sit in the corner and I felt a breeze near my chest and when I looked down, one side of my bikini top was down..revealing one of my maturing breast. I'm certain both the instructors (including the male) saw me and so did the mothers of the children that were getting swimming lessons but they didn't bother to tell me. I don't know why I remember this..maybe because it was so embarrasing...and I never went back there