I have mixed feelings on this subject, and they are hard to put into words. Anyhow here goes.
I do not agree with the killing of native game animals behind fences. If a person can find/hunt them in the wild, then that is where they should be chased.
I am not against killing a non native specie behind a fence. For example I will, every two years or so, kill a European Boar in a preserve located in my Province. I do so because it is the only opportunity I have to chase these animals without leaving my country, and because the meat is organic and it allows me to take the responsibility for procuring my own pork. But I know I am not hunting those Boars, I am merely killing them.
If I could find these same Boars in the wild, then I would not kill them behind a fence.
Lyagooshka your situation is a bit unique. You had no mentors, and a vast amount to learn. I do not think what you did was wrong, and from what you say, you learned a great deal. However once you have gained the ability to find, kill, and process your quarry, I would recommend that you do so outside of the high fences. You will probably feel better for it.
