Social anxiety ??

iam having a wierd feeling that when a group of peoples at my age or greater coming opposite of me i will start to be nervous and always look at my phone that time and if iam not going with my phone i will walk in a awkard way and i stopped going school since one month cause i imagine those wierd situations like walking infront of the whole class and walking through the varantha when the schoolmates are standing on the side, and teacher calling me to come infront to mark the right answer on the chalkboard . the situation getting worse everyday that i started to avoid being social and even started to find shortcuts to reach my home even though that is risky