There are many reasons why you think you won't succeed.
More precisely, there are about 100, according to behavioral economics professor and business strategist Keld Jensen.
In his book, "Intelligence is Overrated," Jensen explores the 100 most significant ideas holding people back from great careers, based on his own research and experience in corporate consulting.
However compelling they seem, those ideas are often just excuses.
Here are seven of the most common thoughts that are holding you back, as well as how to push past them.