If you are meeting a new group (a book club, a professional organization, a debate society, a writing group, whatever) and you feel nervous, bring flowers. Buy a small bouquet and bring it with you. And when you are ready to leave, take it with you.
People in this group will forever see you differently. You will stick in their mind as “the person with the flowers.” Slightly eccentric but in an interesting way. And you will see yourself and your role in the group differently.
I recommend white, blue or lilac flowers. Now yellow and not red.