Answer:
While you were folding a letter you got me. Usually you will do whatever it takes to avoid me but now you can't help but find me.
I have a strong affection for belly buttons.
Ripped from my ancestors home beaten and burned I become a bloodthirsty killer.
I can be simple or I can be complex. I can be found in this riddle or in everyday life. I can be shapes or even colors.
I can be in your body but never on your placemat. I'm always better when I'm fresh, but you'll never see me in the flesh. What am I?
The answer I give is yes, but what I mean is no. What was the question?