Game uses too much RAM

I’m currently working on a 2d fighting Game and I packaged a prototype with 1 map and 2 Charakters to test it. When i try to start it, it takes all 16GB of my Ram and my Pc freezes for one or two minutes. After some time i can play it smoothly but Ram usage ist still over 10GB. Why would it need so much Ram? All the Gamefiles are only 350MB big and the files portrayed on the screen should be less than 80MB. Could the reason for the gigantic ram usage be, that my Texture streaming Pool is over 14000 MB. But how could the pool even be so big, when all the Gamefiles are smaller than 400 MB?

PS: I’m sorry if did any writing mistakes, english is not my first language.