Why are all apps unavailable for my country?

[AC Question]

I want to download an app which my friend has, but it keeps telling me that its unavailable for my country.. It is ridiculous because we are both in the same country, he has it and i dont.. This applies for a lot of apps, apps which i have in my iPad but can't have in my Samsung Galaxy s6 edge.. Temple run, Clash of clans, etc.. apps which are generally available for everyone, is "not available for my country".. My friends have these apps, they download them in the same country i am wanting to download them from.