how do i introduce myself??

i'm going to a new highschool tomorrow and i don't know anyone there. I am very anxious about this and i don't know how to answer when asked to describe myself or similar questions

I don't have anything worth mentioning or any hobbies i just waste my life in my room all day. Sometimes i do go walk my dog but that's it and i don't know how to word it without it being awkward

im sorry i know this is hard to answer but i would really appreciate if someone can help