We are our own worst enemies. Your mind sees your flaws and you focus on them and beat yourself up and it becomes a cycle.

You have to break the cycle. Look at positive features. You might have a hard time seeing them because you've got a veil of disapointment in yourself covering your eyes, but they're there.

Work on your flaws. Maybe your writting could be better, read things and look at the styles of the things you enjoy reading. Consider how yours compares, try to see what things you like about your style, what things you like about other people's styles, and let your style change and grow.

You have to see your good side or you'll always be stuck, you'll always be sensitive to the criticism because you don't look at the good parts of you and only see the bad.