**This is where you belong so feel relax and get over your fear and try to have a good time and be friendly. Smile and enjoy the experience of meeting someone new. If you can relax and enjoy getting to know someone, then that will be felt by the other person and it will put them at ease.
Talking with someone who is super serious and has a grave expression is rarely enjoyable, so why put someone else through that? Relax your face and turn that frown upside down!
Talk to people as you would talk to a friend, and they may just become one.