Replace mental Blocks by counteracting them with positive affirmations. Easier said than done I hear you say, and you will not be wrong there. But it is not about being easy it's all about creating discipline and repetitive behavior and your thoughts are no exception. We all have many a time gone off in our brain, creating scenarios that don't exist, through conversations of what someone might say seeing a doom and gloom item. Too many times we get stuck there because it has become our default button, but it is up to us to keep trying so we can start living the life we want to live.
When start to block yourself try something like this. Things never work out for me and replace with, I know I am not where I want to be now but I know I will be.