To understand why naturism is the ultimate body positivity practice, we must first diagnose the problem:
Do not go to a "clothing optional beach" by yourself if you are anxious. Look for a "landed club" (a resort) that is an AANR or INF (International Naturist Federation) approved facility. These places have strict codes of conduct regarding photography, ogling, and harassment. They often have "first-timer" orientations.
Disclaimer: Always check local laws regarding public nudity and ensure you visit established, legal naturist venues. The naturist lifestyle is built on respect, consent, and hygiene—always carry a towel.