How can I fix my tendency of habitually visualizing what I don't want to happen.

Hi, I tend to visualize what I don’t want to happen because it seems like whatever I visualize never happens, therefore avoiding the unwanted situation. Recently I recognized that this attitude of mine would be problematic if it becomes a permanent habit. It seemed like it prevents myself from new challenges and experiences. This kind of thinking habit also makes me difficult since it seems to lower my self-esteem and it makes me think everything that happens is out of my control and it happens by chance. So I cannot even acknowledge my effort and hard work when good things or things that I wanted happens to me. It’s killing me since it makes me unable to trust myself and leading to lack of confidence. I thought this was some sort of self defense mechanism that can reduce the psychological impact from occurrence of unwanted situation. I thought maybe I do this because I don’t want myself to be shattered by harsh reality that wouldn’t match my expectations of how it would turn out. Anyway, I am trying to overcome this problem but I don’t know how to get rid of such habit. Can I get some professional advices on my situation? Thank you for reading this and I would really appreciate some help.