I have social anxiety, today the residential drug treatment program

I have social anxiety, today the residential drug treatment program I’m in is having a barbecue and the men and the ladies are all eating at the same time. I felt so uncomfortable that I didn’t eat with them. I hate this feeling. I haven’t dealt with it in a long time because the drugs I took, enabled me to interact with anyone I wanted to. Does anyone know of ways to treat or deal with social anxiety? If not could you please just give me some encouraging words cause I’m feeling depressed and very hungry of course