Doubting yourself is a tool for self-sabotage. Doubting yourself is also a habit that can be broken. Believe in yourself. And believe that all the power of the Universe is behind you, providing the wind to propel you forward to ultimate success. If you do insist on doubting something, doubt your self-imposed limits. They are imaginary; you made them up.
Shift from doubting yourself (fear-based living) to trusting and believing in yourself (love-based living). Freedom from self-doubt is the biggest gift you can give yourself this year.