Am I Pessimistic or Am I Optimistic?

When I was in the clinic, a doctor was talking on the phone to a patient who seemed to have a serious illness, she said:-

"Think of the worst, so it won't be the worst in the future, but a bonus!!"

I have a few friends who tend to say I'm a very pessimistic person who likes to think of the worst. And I don't deny that. Many times, when I'm doing something, I would think about the possible outcomes, and most of the times the worst case scenario. So, in someway, I guess they are right.

I've never doubt what they said until yesterday when I was in the clinic, when I heard what the doctor said.

Examining the statement made by the doctor, what do you guys think now? Am I being pessimistic or Am I actually being optimistic.

Maybe because I often lack self-confidence, hence causing myself into believing that many things that I'm doing will not achieve the best results which can be obtained. Prompting me to think about how bad the outcome of my action will become.

Sometimes, after thinking of all the possible worst case scenario, I will also think of possible steps to take if it really happens.

But then again, sometimes I can think of the worst event and yet I become so helpless to do anything about it, if it really happens.

So, back to the question, "Am I Pessimistic or Am I Optimistic?"..

What do you all think?