Today I had interview for admin position so I just searched about that

Actually I have more than 10 years of working experience in administration section. I wonder whether I was wrong for not being able to answer those theory questions but I got highest marks in my performance evaluation in my current work place because I always work my best in practical life. Seriously I only learned the books and theory questions for passing the exam but I learned the real work while I was working in the office. Those interviewer were asking so much questions like "What is the reason behind inflation", What is mean by data mining, What is mean by share market and cash market", What is mean by mutual fund". Are these question are even relevant to ask for the admin position". I really cant understand, am I dumb, I think I am the useless one in home aswell as in work place. I don't know why I am still alive when I am such a useless dumb person. It hurted me alot because I was judged when I hadn't any work experience and I am still judged and should struggle even after having so much working experience. God really hates me. He just wants me to suffer to obtain more trp and views in his show called human life by creating so much drama in my life.