Problems with internal memory (Sony Xperia M)?

I have a Sony Xperia M (Android 4.1.2) and lately I noticed strange things in my Storage menu in the settings. This is what I noticed:
1. I have absolutely no pictures or videos on my Internal Storage and SD card, but somehow, in the Storage menu, it says pictures and videos take up 368MB (I have 2.05GB total on my phone)
2. This one might not look like much of a problem but it also bothers me: it says I have 708MB free memory, but on the graphic presentation of my memory status shows that I have around 20% free
3. I was going to post a screenshot of this all here, but when I tried to open Internal Storage on my PC (connected with USB cable), nothing appeared in it.

I really don't know what's going on and it worries me.
P.S. I have installed ESET antivirus and scanned my device multiple times (deep scan), but it didn't find any threats.

Additional info that might be useful:
-Apps take up 1.11GB of my internal storage
-Pictures and videos, as said above, seem to take up 368MB
-Audio takes up 112KB (I keep my music on an SD card)
-Misc. Takes up 178MB, which seems to be ok, but I'm not 100% sure as it contains a lot of data which is hard to track and memorize
-The apps I currently have are: Minecraft PE, Warspear Online, Flappy Bird, Chess Free, Google Chrome, Facebook, Twitter, Instagram, Youtube, Steam, Tapatalk, MC Chat, Adobe Reader, AppLock and Eset Antivirus. I'm pretty sure all of these apps are secure, because many people use them and they don't take up a lot of memory (Google Chrome, Facebook and Youtube were already on the phone when I bought it, as you probably know)
-I did have quite a few other apps before this, but I uninstalled them, because I either didn't use them a lot, or they started to take up a lot of memory.

All this is starting to worry me, as I bought the phone about 2 months ago. If anyone knows what it's about, anything that can help is appreciated.

How to make a mine craft map in minecraft pe?

I noticed that when you try and craft paper it sayes used to make books and maps. But I can't figure out how to craft one. Any answers?

Added (1). Just to let you know I can't find it in the crafting table.

How to transfer on minecraft?

Basically I have minecraft on my iphone4 but I really want it on my laptop? Any idea's on how to do this? Also for minecraft pe can you tell me some good servers to play x

Villages and jungles in mcpe?

I everyone I just have a few questions will there be any NPC villages in Minecraft pocket edition 0.9.0 and will there be new biomes if so what will they be last question when will 0.9.0 come out

Is there a glitch on my minecraft pe?

The keypad isn't showing up and on my minecraft pe version 8.1 so I'm really confused I tried deleting the app and when I re uploaded it, it still had the keypad not showing or any of the blocks I can still move around but it is hard to find where the keypad is can you help please and tell me what I did or what's wrong

Are the keys for Minecraft PC hard to remember?

I already have Minecraft pe and Xbox but not PC. I don't know what the keys are or if they are hard to control and remember.

Do I have to make any purchases outside of the Minecraft Pocket Edition App itself to use it?

I'm on the Minecraft website and I tried to join, but it is asking me to pay money. If I just download the app will the payment still be required of me?

How to Make My Minecraft PE Village Look More Roman/Greek?

So, I was hosting my server on MCPE, and someone who's been a member on it for quite a while asked if I've built a volcano yet (implying I'm making a Native American kinda village; I realize there was a volcano that destroyed the Roman city on Pompeii, but when most people think of volcanos destroying things its Native American villages). I was kinda disappointed, because I VASTLY prefer building Roman and Greek style buildings in Minecraft. How/what can I build that will make my village look more Roman/Greek?

What is the next version in Minecraft Pocket Edition? And?

The current version is 0.8.1 and it has been out for ages and I was just wondering what and/or when the next update is coming out? I have already googled it and checked Minecraft Wiki etc. But I can't find anything. I play Minecraft on my iPod so it's the IOS version that I have.

If someone does know what and/or when the next update is coming out please tell me as I'm so bored with 0.8.1.

This is probably going to stay unanswered but does anyone know WHAT will be in the next update? I'm hoping that Mojang will give players in Creative worlds access to the Nether as they have been promising that since Summer 2013.

Added (1). Hi Pete I looked on the link and nothing came up. It just said something about how Mojang had confirmed that the content on that page will be in the next update so they are hiding the information until the next update comes out.

Minecraft PE players! QUICK?

My friend and me play on a server online. But she spawned in between bedrock and the end of the world. Every time she clicks the chat box she disconnects! Any ideas? We have a mod friend but he's not online at the moment. We can wait but I want to help As soon as possible.