From happy to depressed

I was a happy, extrovert boy til 3rd grade, then I got shifted to a new school in a new city, so called ‘best school’. I got bullied a lot. I don’t have friends, literally. It hurts me a lot.
Everyone have friends in my school and they celebrate their birthdays, I don’t have friends who even remember my name. It hurts me to such extent, that my mind has stopped working, as it used to be earlier. I am a multi-talented boy, but nobody knows it,and it hurts me a lot. I badly need a friend or someone who knows me.