anxiety cultures

My brain cultures my anxiety and makes it thrive and flourish so that good thoughts and feelings are starved to death. Why does my brain do that? Am I doing it? Do I have any control or any saying? I don't want to feed my fear, but somehow it's happening. Yoga and meditating is terrible. Concentrating on my breath freaks me out. In my view who ever said that this would help never had an anxiety disorder. It is very different from being afraid sometimes. Is it really a disorder? Aren't people who don't think about all the bad things that could happen just to narrow minded? Aren't they just naive? In my eyes they seem to be like children that don't know about danger, but it is still exists. I know that this perspective is not right. I'm the one who isn't right, am I? You see sometimes I'm right, my fear was right. Things do happen and in some situations when I tried to ignore the fear it was wrong. That is my dilemma. How do I know which fear is good and which one I should discard? My brain needs a new reliable sorting algorithm. Until then I'm culturing my anxiety even though it's crushing my mind. I lost control a long time ago and trying to gain it back feeds my anxiety even more.