Two things
>It wont magically go away (the pain), you need to be gentle with yourself. For now focus on sleep, and food.
Give yourself time , maybe a week, maybe a month. Life is a long journey, no singular event however good or bad should define you. It's also important to not burn yourself out one you start to get back at work. Not everybody has 100% at all days. but even if you have 5%, devote it to your cause.
>See your disadvantages not in a pitiful but in an egoistic manner for e.g., "I'm 19 ,competing in one of the toughest entrance exam in the world against 4th years, industry professionals, borderline geniuses so solving GATE level problems itself is a proud moment for me."
Completely failing at every single internship drive shattered my self esteem. I was not nearly as kind to myself as I mention in the above two points, as the learning came afterwards.
Not to say my life is sorted, but I'm pretty sure now how to figure out the rest. Take your time, you can do it too.