Not trying to throw a low blow or anything, but have you looked at your quest log? There should always be some class quest active since its your class quests that lead you through the game. Whenever you complete one, you get another..no ifs, ands, or buts about it. If you absolutely have no quests active, is it possible you could have abandoned/untracked it (not even sure if this is possible for class quests)?
Since you say you haven't aqcuired Corso yet, you still have some storyline to go before you get off the planet....
If you don't have a single quest active, could this be a bug/glitch? Anyone else have any idea what the issue could be?
Hope you get help soon.