Continual habit of self deprecation. Many people put themselves down, pointing to their in-abilities, inadequacies and weaknesses. People generally underestimate their capabilities and stress weaknesses rather than strengths- particularly women and in CV's. I believe this is the reason why many people live lives of mediocrity, never becoming what they might have been by realizing their full potential. Change is not nearly as dangerous as what people think.
Most people remember past failures with guilt rather than celebrating what they did well.
Take the credit yourself, no matter how small your achievements. We are all very easily susceptible to the negative influences of other people. Don't listen when others say you can't do it. Dare to be different and to what your heart says. Don't think negatively in terms of failure.