i'm starting my first job tommorow, how can i learn to deal with so much work and responsibilities?

i need to make $10,000 from my job and balance high school. the loneliness and depression is eating me every day. i dont know if i can do this. i cant sleep and i dont know what to do. its making me anxious. i dont leave my house often. i have to wake up at 9pm. at least some part of me thinks work will make me a little less lonely, i think most of the people working there are a lot older than me though.