For girls: If I know said girl ill probably be happy, and more relaxed. If its someone I dont know to well, im more reserved and quiet.
For guys(aka best friends) We have known each-other FOREVER like six years, but im usually cocky and swear a lot( ive been trying to grow out of that)
To people i dont know very well: I dont usually say anything
I honestly know what you feel, sometimes I can just freeze up randomly and make it really awkward... sometimes messes up a lot of friendships...