HELP ME PLEASE! I REALLY NEED IT I'M ON THE VERGE OF DESPERATION AND TEARS A LITTLE.. :(?

Ok so heres the story I met a guy gave him my number on a Thursday and he called me on Monday, we had a short convo and it was kind of awkward because we had never talked before so I waited a couple of days and called him and he didn't answer so I left a message but he hasn't called me back yet so I don't know what to think... what did I do wrong?? What do I do now?? just wait or what? I'm so sad and confused I mean I guess he could be busy but idk..??