why not look into a gun smith school and learn more about how they work and are built, if nothing else it will teach you some machine skills for other things too!

everyone can have a hobby, and not everyone will like your hobby , its life
as long as your being careful and respectful of all sides to firearms and society, I think you can end up in a good career in them if you stay interested long enough to see it thru
NOW on the mental status of you and your past, future, I cannot say really anything as I DON"T Know your history, this COULD be a limiting factor, but if all good there, nothing wrong with a strong interest in learning about guns IMO
I am sure even your country's military has need for gun smith's and or possible designers for new and improved weapons LOL as I said, there could be a career in things if you have the desire and wish to learn things and have the talent to go with it all1