Newbie,
I'm so sorry! You're having a rougher time of it than I did, but it sounds like you really want to go to USC. If that's what you really want, try to find alternate ways to pay for it than waiting for the school to give you money (which not many people have good chance of, at least from what I've seen). What about the state? Do they give out any sort of grants or student monies that you could apply for? What about community scholarships? If you join a sorority, they might have some sort of scholarship plan, too. (My sorority has scholarships that members can apply for to help pay for school.) I'm just trying to throw some options out there for you, but I don't really know a whole lot about it because I'm from the other side of the country!
Please, please try not to worry about your parents. That's what made me the most miserable in the first place (my dad wasn't thrilled about me going to the school I'm at), but you know what? I was frustrated the other day and mentioned something about transferring (I didn't mean it), and he got this really sad look and said, "But...I always hoped someone in our family would be able to graduate from UK." Not that it's a top school or anything, but it's the best in our state and the best we could hope to afford, so...but my point is, sometimes parents say things they really don't mean (or will rethink later). He's probably just as frustrated as you are because he knows how much you want USC and it's not going to be easy, and he probably hates seeing you so upset.
What I would do is, just try to calm down and call the school. Surely they could work out something, because your grades kick butt and I know they want students like you. Your sophomore year is NOT ruining your chances of getting scholarships, because more likely than not even if you had a 4.0 that year you still might be in the same situation. My school is not even close to being a top school in the nation, but they are extremely stingy and it is really hard to squeeze any sort of aid money from them whatsoever, so just think how much worse a better school is going to be. So please don't give up!