My ipod 4g 8GB Says ive used 3.6 GB When i haven't.. i have barely any music and 5 apps.... HELP PLEASE

I need some help... My ipod is a 4th Gen 8 GB touch I have

640 MB of songs

photos and camera 558mb

ifunny 264 MB

TextFree with voice 121MB

Temple run 38.4MB

Doodle Jump 37.0 MB

And no video data

This equals upto 1.61953125 GB of data

My ipod says capacity is 6.4GB... BULLCRAP If i only used 1.6GB and my ipod

says available is 2.8GB Apple is full of crap And ONLY CRAP so technically right now my ipod is only getting about 4.4GB of data Wheres my other 2 gigs? Anyone wanna explain