Why is my iPhone 4 memory low?

I checked the settings and it says capacity 6.3 GB and available 1.1 GB

But I hardly have anything on my phone?
2 songs, 7 videos, 315 pictures and 18 apps.
Shouldn't my available space be more than just 1.1?

And also, would I lose my pictures and everything if I jailbreak it? And how would I jailbreak it?
iPhone 4 iOS 6.1

Deinently jailbreak it, it's worth it.
You'll need to grab evasi0n to jailbreak it with, just google it.
Really easy.

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