I thought I wasn't good looking back in high school. I was a late bloomer so around 16 years old, I started to shop for myself, clothes, makeup, people started treating me differently. I realized that a proper outfit and looking good builds confidence.
Being attractive is a learned behavior.
Exercising to look good, good out fit, hygiene, posture, personality. All of these can be improved to make one become more attractive.
So when did you realize you were attractive ?