What you are describing are the symptoms of social anxiety.
Social Anxiety can have various causes, which cannot be pinpointed till a detailed evaluation is done.
Depending on the distress level you may need either only therapy, or both therapy and medications combined.
Cognitive behavioural therapy has very good evidence of efficacy in social anxiety disorder.
If you do not want to approach any psychiatrist, there are self help books also which may help you if you follow it consistently.
But in my opinion it will be better if you consult a psychiatrist and get their advice.
Next Steps
you can consult any psychiatrist near your home or you can book an online appointment with me. I give online appointment and therapies.