We've all had to deal with tough critics, and sometimes your toughest critic lives in your head.
insecurity
#89: Countering a Cruel Inner Critic
Some inner critics need love and some need reassurance. Yours needs to be gently but firmly set aside. It exists only to harm you, and has no place in your life.
NaNoWriMo: How to Counter Jealousy and Insecurity
It's very easy, in this atmosphere focused on numbers and "winning," to get jealous, and anxious, and insecure.