iPhone 4 showing incorrect data usage in settings? PLEASE HELP ASAP

Hello all, today I decided to turn on cellular data to recive a picture. When I went to turn it off I looked at the data usage. IT SAID I USED ABOUT 20 GB. TOTAL!!!!!! Is this a glitch because I have push notifications for apps and email push turned off. I only have 10 apps installed how would I even use that much data and BTW I was on wifi and left the screen locked for about 20 minutes! This better be a glitch or my parents will slice my head off. I know for a FACT I havent used 20 gb of data. I did reset it about a week ago and have had 3G off since then. Does anyone know if it's a glitch. I DO NOT have unlimited data. Please help me I'm about to have a panic attack I'm so scared. Does anyone know if its a glitch? I also noticed that the battery usage setting somehow turned itsself off and I have been having to reset my network settings a lot. I'm very scared but still need to know the truth.

 

Nevermind, it's a simple bug.
https://discussions.apple.com/thread/2620623?threadID=2620623