I used to spend a lot of energy being concerned what other people thought of me. How I dressed, how I acted, what I owned, etc. One day I realized 2 things:
Most people are too busy thinking about themselves to spare any meaningful thoughts for me.
I'm never going to see most of these people ever again so it doesn't matter what they think.
After that I started directing that energy into making sure that I approved of my choices rather than hoping strangers would.