I am so, so sorry you are suffering so much. It may help you to know that you are not alone. Social anxiety is the 4th most common mental health disorder. In the U.S., it was found that about 12% of the population suffer from social anxiety at some point in their lives. (I couldn’t find a statistic for India but I’m guessing it is similar.) Social anxiety often very negatively affects someone’s ability to function at school, at work or relationships.
You are not an “empty box”. You are a sensitive person who is struggling with a real disorder. Just as you would go to a medical doctor for a medical problem, I hope you will see a mental health professional for this serious mental problem. Yes, it is serious. But the good news is that it is very treatable. A counselor can help you learn skills for coping with social situations and for building your self-esteem.
Meanwhile, there are dozens of Youtube videos about social anxiety and how it can be managed. Do take the time to review some of them as a first step for self-help.
I wish you well.