What is the most embarrassing thing about being mistaken for gender because of your name?

My name is very masculine. I remember sitting casually on the first day of school when I was in the first grade. Basically, boys sit together and girls sit together. I raised my hand for a long time when the math teacher called the roll, but the teacher didn't see me. The teacher saw me and said, "I thought it was a boy, so I kept looking for you among the boys, but I didn't expect it to be a girl." At that time, the whole class looked at me and laughed. It's embarrassing.