I am disappointed  in my friends for not telling me about Joe.
Does this guy Joe have anything to do with you being dissapointed?
Yes, I'm pretty excited to be friends with someone like him!
Your friends don't know whether you would get along with someone from a glance. They may not even know Joe so it's wrong to be disappointed with them because they didn't introduce you to him.
I'm pretty excited about that. I just need to find them.
It is not really your friends job to tell you about this guy Joe, so try to be easy on them. Instead, maybe you can bring it up to them so they know you are now friends with him.