IPhone 5 has no memory but has barely anything on it

My iPhone 5 has like 900 MB left but it's impossible that this is so.

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I have 7 apps, I have no videos, I have no music, I have 500+ pictures and that's about it.
It doesn't make sense that I could have possibly taken up so much space?
It's a 16GB iPhone 5 and it is fully update to iOS 6.1.2.

How can I make it have more space? Why is it doing this? I have no clue what to even ask because I don't understand what's wrong. I have a lot of space, but my phone doesn't say so. What do I do?

And please don't tell me to go to an apple store or anything at all with apple because obviously I know that I have that option, but I'm here for a reason. Please please help. It sounds stupid but my phone is literally my life loljk but really help.

Just take it to apple. Its probably a rechnocal issue. They'll give you a new one or help you fix it