How do I portray a more mature demeanor?

Red_Raconteur
I'm 22 years old. I have a job. I have a steady boyfriend. I have bills. I have a cat.

When I went to see Men in Black III the guy selling tickets checked my ID. Last weekend I tried to go out with my friends and got denied entrance to a bar because they thought my license was fake. When I met clients in the lobby this morning they asked if my mom or dad had brought me to work with them.

I wear sophisticated clothing (for the most part, sometimes I'm more casual, but rarely). I wear natural looking makeup. I style my hair. If anything is going to make me appear my age it's going to be my demeanor and attitude. Anyone have some good advice?
How do I portray a more mature demeanor?
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