I'm depressed and don't know what to do?

I am failing four classes and i just want to sleep all the time so i can stay dreaming i'm always looking back on the past and thinking how much i wanted to grow up but now all i want is to be young again the only good part of the year is summer vacation and i don't know what to do i don't want to go to summer school and i often think about dropping out i don't know what to do please help me