Hi there. I feel like that all the time as well. I used to wonder if there was something wrong with me in particular or if it was related to my depression and social anxiety. I decided that I would not worry about it anymore. I can carry on a conversation just fine with family and friends that I have things in common with. As for coworkers, random strangers in grocery store lines, or passing acquaintances, it's not necessary for me to keep up my end of a totally pointless conversation. Sure, I'll be polite and cordial, but I refuse to feel bad if a coworker thinks I'm rude because I don't want to discuss football or the beautiful fall weather with them.