Is this normal? i overthink.?

I over-think everything, i spend every night deciding on how i will get up tomorrow, what i will wear, how i will walk, every single detail for tomorrow. I question myself on everything i do. If i make a dissension i spend the next 20 min's deciding if that was the right one. If i'm sitting in class waiting for my turn to present. I'm thinking in my head how i will talk how i will get up there. I am thinking of scenarios on how i will present. Every little thing that worries me, I contemplate in my mind. Even if im on the road looking out. Im thinking of scenarios of "what if". everything worries me. is this normal? and im 17 if that helps.i dont have OCD.i dont obsess. i just overthink. i am calm and i am a bit of an over achiever. Everything i try to do is already thought up, in my head.