No, not, don't, can't, won't, and what if's these are the usual manifestations of negative thinking. It is if they have this function to build a wall between you and the place you are going; thus, holding you back from doing something without even trying. That is how evil negative thoughts can be.
Your words and thoughts can chart the course of your week/life, so be careful what you let come out of your mouth as a result of your thoughts. However you want your life to be, speak it, think it!
How steady is your mind in the midst of all that's happening? That will determine what flows out of it!