Hello,
The first thing you need to do is go to a Psychiatrist. Dr Vipul Rastogi in Medanta is good and you can give him my reference. Second , start counselling/ psychotherapy with a therapist. You can do face to face or online sessions with a therapist.
Next Steps
With the above to steps Larn to identify the negative thoughts and do the opposite of what they tell you to do. For example , if you don't feel like meeting people, deliberately make a plan. Seek help of a trusted family member or a friend to call you and meet you and take you out every three days, even if you refuse and don't want to. Also, externalise your Depression. This means you behave the way you do or think the way you do as a symptom of Depression. See Depression as an illness that has symptoms affecting you. This will help you rationally and objectively see your issues.
Health Tips
Exercising and eating right is extremely important and helpful. Indulge in Pleasurable, Important and necessary activities everyday . Make a list of each kind of activities. MOST IMPORTANTLY - SEE A PSYCHOTHERAPIST AS SOON AS POSSIBLE.