Why Ask 'Why'?

So I have this strange habit of asking why all the time? I have this constant thrist to know what is running through someone's head.

All will be fine. We'll be having a normal conversation and then they'll make some comment. Then they either make a face or I imagine they've made a face and I blurt out "why?"

It of course then makes the situation completely awkward because, without fail, they always just answer. I don't know I was just commenting. Then I feel like a complete idiot.

I wish I weren't so paranoid and awkward all the time...