I agree with WWWard in reading the post made in the first link.
Second, “Chance me’s” are typically inaccurate as everyone has their own opinions, but I know some type of answer usually gives us a piece of mind & almost everyone on here has made a post like this. So, in MY opinion, I think you have amazing ec’s as they really showcase your leadership & interests. Your GPA is above average, and your ACT is fine. Like many colleges, USC has a holistic admission process – your essays & short answers are really the defining factor in your application because they demonstrate your personality, passions, and future goals. As long as you clearly convey your ideas to admissions, you’ve done the best you can do at this point. If USC doesn’t admit you, it might not even be your fault. They may feel that you would fit better at another university. So, YES, do apply because you’ll never know and this is your only chance. Applying won’t do you any harm (except the application fee lol), and it might even give you another acceptance! Good luck :’)