So here's the thing about body positivity: Try as you might, you probably won't feel like cheerleading for yourself nude in front of your full length mirror every single day (or, well, ever). Even those of us who generally feel good about our bodies don't feel it every single day, and that doesn't mean that you're "doing it wrong."
To read more: https://www.goodhousekeeping.com/health/wellness/g35182990/body-positivity-quotes/