My iphone 5 is using 7.1gb of memory on photos and i have only 200 photos?

I recently discovered that my iphone would not allow me to take pictures as i was out of memory it says i have 3gb left of 10.3gb and the most usage by a mile is my photos which is using 7.gb of memory all my other things arnt even a gb i don't understand this as i have around 200 photos in camera roll same in pictures and 33 videos, but surely that wouldnt use 7gb would it? It also keeps attempting to back my phone up but gives error of no memory please help thanks.

It's an iphone, and therefore completly mental.
buy a phone with a decent size memory or simply delete your photos!

Depending on how long the videos are, yes, it could be normal. Photos themselves shouldnt take up more than 1gb by themselves, but if you have 33 vids, if they are long enough and of high enough quality, it could definitely take up that much space.

My guess would be those videos. I'm not sure the quality the iPhone 5 records in, but my iPhone 4 used up 150 mb on a 6 minute long video just now. Imagine the data if you have 1 hour of footage in 1080p. I think it may also be all your apps, you just don't realize it. If you have 20 apps at say 50 mb a piece (which is a low estimate for most people) you're looking at a gig alone for that. Music also takes a chunk, I have 3 gigs out on 120 songs.