When I was younger I also suffered terrible social anxiety. I was extremely shy, would turn beat red like a tomato and would get panic attacks. I used to get a failing grade on a project if it meant getting up in front of the class. I also had social anxiety and still have it a little BUT its improved greatly. So you're not alone and it doesn't mean you're a loser. Yes kids and teenagers can be cruel and they're losers for laughing.