Start with some making out then move to heavy touching etcPublic play is one of the things I have always been reluctant to try. I've done it but rarely. Even before I met my husband when I didn't have to worry about anyone recognizing me I was uncomfortable. I don't understand myself lol
If its a fear of being recognised there's not a lot you can do except going to some distance place.
If it's performance anxiety let you partner led by example or if you are comfortable start with your hand or mouth.