How do you become more comfortable around your girlfriend?

I am a girl and the best thing I have always likes in guys is when he is just himself and not trying to hard, you can pretty much get along with anybody no matter what I have very many guy friends of different groups just because I know they are being themselves. It Also helps if you just try and ask questions and get to know somebody at school or a game or a dance or something, I have always liked guys with a little humor and have a good conversation with. Just try not to be shy or think about things to much just be laid back and go with the flow!!! Maybe you could just talk to a girl about something you may have in common or ask if they just want to do something and try to get to know them!