how are you?

Sometimes, this question ‘how are you?’ is very difficult to answer. Properly the hardest question in the world.

May be I don’t know where to start explaining my situation. It’s long and complex.

May be I even don’t know clearly how I am. That’s a worse case.

May be you are not the one who I’m willing to tell u how I am. You are not a total stranger, but not a close friend neither.

May be you are basically a jerk who messed up my life and I don’t really wanna let u know how I was suffering and how I am alive now.

Therefore, I don’t know how to answer ‘how are you?’.
I'm more than curious that why you asked me 'how are you?'. Indeed, do you care how I am while asking? 
Well, whatever. It doesn't matter now, because I'm fine.