Oh boy.
I am immediately reminded of something I read in "Call of the Wild" by Guy Grieve. He left his family in the UK to go build a cabin and live in the Alaskan bush. If it were not for the help, and charity, of locals, he could well have died, certainly he could not have lived there. The locals said it was a strange affliction of people from tamed lands that they would want to come and live alone in the wilderness, while for the people who were born to that land, life was about family.
I am not sure whether your questions are rhetorical, or whether you really want someone to tell you why you need permission to hunt/live in most places. Maybe there are fewer restrictions further East. Have you looked at Romania?
Have you looked up Heimo Korth. Where he lives, in Alaska, they have permission but it does not extend to his children.
Dick Proenneke is another interesting character in that part of the world.
You might get on well with Torjus Gaaren, who was once a member here.
http://livingprimitively.com/ He lives in Norway and does a lot of primitive skills. His family has a mountain farm north of Fyresdal, Norway. The land is owned, or at least it is not free. We could cut all the birch we liked, but we had to leave the ancient spruce as they had commercial value. Hunting is controlled.
I hope you will forgive some of us older folk for thinking you might be a little naïve stating such a goal in so simple a way and asking those questions. It would help if you could describe your current level of experience, what you know, where you have been, and maybe elaborate on any plan that will improve your chances. Chris McCandless's story is a salutary tail. He was a pretty experienced traveller, but he still died alone.
You might get a lot of negative advice here. I won't say you shouldn't be discouraged. People are friendly and if they ask hard questions, or raise doubts it because they don't want someone young to get hurt (and maybe cause danger for others in the process).
My best friend has done some pretty amazing travelling from quite a young age, so I know it is possible, but he visited with local people, learned from them, and while he learned primitive skills, he travelled with the best modern gear he could get.
All the best
Chris