And it is true that some people just don't click. Talking to some people can be difficult and others natural.
About a year ago I met this girl that I would see like 4-5 days of the week (but in a crowd) and she was so much like me it was scary and definitely my type. She was a cute blonde metal-head with the same retarded outgoing personality and same tastes as me, but as soon as we'd hang out alone it was like fucking crickets chirping. I don't know how the fuck two people that are so similar that are clearly attracted to eachother normally can't think of ANYTHING to say when the chance is there.
Not only that, there is this wholesome, nice, pop-punk listening Christian girl that I can talk to about anything and everything to the point there are practically no secrets. Only thing I have in common with her is an outgoing personality, and I can talk to her for 6 hours straight. We have to pause movies and shows for hours because of it.
People are weird