It is the nature of most interactions with strangers. Most people prefer to speak to many people sporadically and superficially. Many realize it's not that easy to talk to just anyone, find common points of interest, or maybe decide that you two aren't going to have engaging discussions long-term.
We are very lucky when we find one person who wants to talk to us again and again. It won't be everyone. Chat to people, don't expect too much too soon, and maybe you'll have the good fortune of finding someone who is as committed to a language exchange as you are.