I think that the most embarrassing experience I had was when I once confused my sneakers with my friend's.
Once, when I was in the 5th grade, I really wanted to have some cool sneakers. My parents bought them on my birthday and I was really happy. In winter we changed our shoes at school and I wanted to use my new sneakers there as indoor shoes. At my classroom I confused them with my friend’s sneakers and we had a fight. It turned out that my grandma changed them for other sneakers without letting me know and my friend’s parents bought him the same type of sneakers. I felt really embarrassed when I realized that I was wrong.
So that was the most embarrassing experience in my life.