Selfish-ness

I feel I very selfish, most of the times.

I talk to you happily,excited when I wanted to. I never talk to you when I don't feel like talking(which most of time is I tired or moody)

Is it just me or everyone also the same?

Sometimes my friend play a fool at me and I will fool him back or joke with him.
Sometimes my friend play a fool at me and I just smile reluctancy.

Or is is I got double personality. This is just one of the example of myself, there is more that i feel I am weird. Hmmmm..