Internet is not the best place to find out things.. Please consult a professional before self diagnosis. Also, at your age symptoms of depression could be just because of hormonal changes and nothing else. So please don't read too much into it. As far as auditory hallucinations are concerned, a person usually having hallucinations is a bit unaware of the same. And if you can reason it out it's not a big deal. Please consult a good child or counseling psychologist for further help with your emotional issues. And go with an open mindset for a diagnosis if it is suggested. If you're in Pune you can consult me. Also find a hobby and listen to affirmations by Louise Hay on YouTube. These two things should help you feel better.