Aww . Sorry to hear that you're struggling.

Is there some sort of guidance counselor or student head that you can talk to to get more info on dropping your class? Maybe it's not too late? Even if it is too late, it's good to get it confirmed from someone so you won't be left wondering. Also, you could bring up the fact that the class is affecting you negatively and affecting your work in other classes, so maybe they'll let you drop it because of that.