Insecurities
Feeling of insecurity is a natural feeling, all of us have it about different aspects of life and career. It's neither good nor bad. How we choose to use that feeling determines how significant parts of our life play out. There are always 2 options
A. Use the feeling of 'not being good enough' in something as a motivator to try harder and move forward,
B. Use the feeling of 'not being good enough' as an excuse to get stuck
For instance, I may be insecure about my competence with numbers or communication skills. I can either use it as a motivator to work hard and learn it, or I can use it as an excuse for not knowing Excel/ avoid public speaking and therefore as an excuse for why I cannot grow in my career.
Feelings by themselves aren't good or bad. How we channelize them makes or builds our trajectory.