If you appreciate yourself, and look at yourself as worthy of whatever you find important, you will automatically have high self esteem, and a strong self image, which is your conception of your beliefs about yourself.
In fact how you see yourself will always influence your thoughts, your actions, your feelings and your behaviour. And all that put together with your abilities and from that comes the results you produce in your life.
So if you have low self esteem, you will have an inner image of yourself as some sort of a failure or defeat, and you will see yourself as not very worthy, and probably feel like you are a victim of circumstance and bad luck.
Learn more on how to build self esteem