What is considered as "Apps" in mac storage

Hello, I have a 2012 13" macbook air, Its fully functional and I'm very happy with it, however I recently checked out my system storage and noticed that I had 15gb out of apps, however when I checked the application folder, I only got 6gb of apps. Now there is something else, there are no pictures and no music of mine on my mac, yet the system says I got 2gb of audio and 2gb of pictures.... Anyone could explain this to me ? because I was supposed to have a 128gb macbook air and I only have 85gb with nothing but the already installed apps and only Iwork09.
Thank you

Sorry I meant a 121gb hard drive

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