Uncomfortable people

There are several kinds of people who I feel uncomfortable to talk.
One day, a friend was talking to a person who I'm not good at. I was just looking the two of them thinking like, "I feel little strange with her, but she (my friend) can talk with her very naturally."
At home, when I'm recalling that scene, I suddenly thought, "If my friends covers the type whom I'm not good at, then I don't need to drag myself to make friendship with them... My friend covers them, and some of which (friend's friend) may have a friend whom I'm good at."
I don't need to be hasty for making good relationships with all the people I met. While I can't act kindly, I just let my friends to act.
Then it'll be all right.