After playing tennis, I found that I really don’t like socializing and even have social phobia

I have been playing tennis for about 10 months, 140 hours of playing experience, and only take private lessons or practice with the coach. The coach has introduced me to countless friends, but I have never made an appointment with him, which is a waste of the coach's kindness. I don't know if it is because of my personality or my poor skills, but I don't like playing with strangers. It's annoying.