stop playing for a moment and listen, get your body involved, find the beat.
you can start playing just bass notes, listening and following along.
alternate hands - to the beat. this may be your comfort zone for a while. see how relaxed you can play.
listen, find the beat, feel it in your body,
then play.
do your best to contribute to the group sound.
no rings - hurts fingers and drum heads
do not play someone else's drum unless invited or unless you ask first, and they agree.
there are different kinds of drum circles, some are culture-specific, some are open to all, some are acoustic only, others allow kit drums and/or electronic instruments, some are quite large - 75+, some are small, some are a free-for-all, and some have facilitators.
finding a good fit is not always easy. local facebook groups may be a good place to start looking for in-person drumming events.
be conscious of the environment. "read the room."
respect others,
if you will be producing sound in spaces you share with others - why not ask if it's okay with them, or invite them to play too?
hand drumming can get loud, but it isn't always. there are ways to mute a drum, like throwing a towel over the drum, or using dynamics and mute strikes.
when outdoors - others may be there to enjoy the sounds of the ocean or of nature and your drumming, no matter how good, may seem intrusive to them.