Social anxiety

3 days ago there was an field visit of my class , I only attended this class bc it's my minor/optional subject, but I loved it always and when I got to know abt this visit I decided I'm going , but my friends which also had this class as minor class were not coming due to their respective reasons ,.so I was left alone with the other students of class , whom I'm friends with actually but not much close , bc it's just twice the week we meet for class , so to next day , at visit, I found myself alone , everyone had their groups , and i didn't, I tried to squeeze myself in , but i couldn't, I was alone all the time , even ate myself alone at the corner , I was so apart I was not in any photos taken , nor i dared to , as for visit, it was good I learnt things , but the part of socialisation made it one of my worst day of my life.

I tried hard to interract but i couldn't, my social anxiety is going pretty worse day by day , idk how do I deal with it.