Question about my Running/walking/standing posture?

umm I know this is a really weird question, but that's why its on off topic. But anyway I am an average cross country runner, and I realized that I can be a better runner if I get these things to put in my shoes for my flat feet. I also realize that I have a very strange walk or gait, when I run or walk my feet point outwards even when I'm standing my feet normally point outwards. I would like to research this problem to become an even better runner and pursue my dream of one day running a marathon. But I don't know what it is called is their any thing I could search to find out more about this problem? Thank you very much