With a healthy level of self-esteem you will not be worried about what other people might think of you. You feel comfortable with who we are and you like what you see in the mirror. You don't feel the need to seek the approval of others because you feel secure within yourself.
A poor self-esteem can undermine a person's ability to enjoy success and establish fulfilling relationships in their life ...... They may well find ways to sabotage themselves if they do not feel that they are worthy of being happy. They may well put up with poor treatment or even abuse from others unless they learn to feel entitled to expect more.
Have a look at this video, which explores the importance of self-esteem as an essential foundation for developing more assertiveness in your life ..... And never for one moment doubt that you can begin to make changes in your life - starting right now, if that is what you decide
Seven keys to becoming more assertive"
Here's a terrific resource that offers you the guidance you need to develop your assertiveness