"Self-esteem is how you feel about yourself. You may have high self-esteem—you believe you are a good person—or it may be low, and you question how "good" or "worthy" you are.
Everyone has low self-esteem at times. It may happen when someone says something bad about you or questions how well you do something. But if you often feel bad about yourself, you may stop believing in yourself. You may find it hard to meet your goals and enjoy life.
People who have depression or anxiety or who are sick or have a disability may have low self-esteem. Building self-esteem is a lifelong process, but it can help you feel better about yourself and your life. Here are some ways to build your self-esteem. Start by picking something you'd like to try now. Later you can decide if you'd like to try other ways." - WebMD