A healthy self-esteem is described as a positive attitude towards yourself. It includes an appreciative, realistic, and balanced view of yourself.
It's normal to sometimes be critical of yourself and engage in negative thinking about your abilities from time to time. We all do that; but when you tend to see yourself as incompetent, unworthy or inadequate for most of the time, your self-criticism becomes a low self-esteem issue.
If you want to feel good about yourself, you need to nourish your confidence. Mental health professionals have found that mindfulness exercises can help you overcome low self-esteem. Mindfulness trains your mind to observe your feelings and thoughts as they appear, without reacting to them. In order to build your self-respect, you need to be willing to turn toward and acknowledge your negative emotions.
Practicing mindfulness allows you to feel the way you are feeling instead of avoiding these thoughts and feelings altogether. If you learn to acknowledge your feelings and allow yourself to feel that way in the moment, it is more likely for those feelings to settle down and pass.
Focusing on your breathing and calming your mind and body for a few moments every day should help you will feel more relaxed. When you find yourself starting the usual self-criticism routine, acknowledge what is happening and remind yourself that those are just your thoughts, not facts.