Some people find it helpful to wear a pin or other symbol that identifies you as a believer. This can help break the ice when introducing yourself. Both God, and God's people can be found everywhere. Look at the passage below. They devoted themselves to the apostles teaching and to the fellowship, to the breaking of bread and to prayer.
Christians meet together to share spiritual truths.
They are prepared in heart and mind to be a blessing and to be blessed. Fellowship, like most other things in life is enhanced if we are prepared for it. We would not expect to have a good day sailing on the lake unless we have learned how to sail a boat. In the same way we should not expect to have good fellowship unless we are prepared for it. Be prepared to be a blessing to someone by being grounded in God's word.