Negative attitude

I'd like to write about my concerns, I'm concerned to be a very negative person.
I've got negative attitude and I'm sadistically enjoying my negativity.
My negativity is spreading among my friends, colleagues and it is jeopardizing my professional growth.
Of course this is all my fault.

At least this is what I've been told.

Is it true? Am I negative? What is it making me negative? Am I going nuts? Am I seeing ghosts?