Don't worry about "dealing", just do. Show up, go to class. And by the sounds of it it's your first year, and if that's true don't worry so much about what classes your taking. Hell, don't worry about that at all unless you've got a specific career in mind, and in that case just go with what is needed for that.
Otherwise, individual high school courses, if you find yourself graduated and missing something you needed, are easy to make up after the fact. Don't worry about it unless you have specific goals you're driving for.
For sex, social life, and job. Not sure what the big deal is, granted I skipped the sex part, and a social life short of that requires nothing, just be friendly with everyone and spending day after day along side them is sure to net a friend or two, just go with it.
A temp job is something you want or something you have and aren't sure how to deal with? Not a lot of advice to give either way. If you don't have but want one, just start applying to places, google something along the lines of "resume writing for high students" if you need advice on how, although generally people employing high school students aren't too concerned with such things anyways. If you already have one or when you do get one, just show up, do what you're told, not much else to it.
Edit: On second thought, I would like to revise my entire post to that last part.
Shut up and do what you're told, that's how you deal.