I think my friend's girlfriend is annoying
What makes you think that about her?
She is the kind of person who talks to you about herself
Maybe you should talk to your friend about this? He might not even know that his girlfriend is having that effect on you.
That would be a waste of time. I'm going to talk to other people who doesn't give a shit about her.
Why do you think it would be a waste of time? I think he would be upset if you didn't want to hang around his girlfriend. Give it a chance to see how he reacts.