As a man thinketh in his heart, so he is. You are a product of your thought. You are not different from your thought. If you have a low self esteem, it's because of your thoughts. You are responsible for your thought.
There is nothing anybody can do for you, if you do not change the way you think. Your thoughts can be wrong. Your actions are because of your thought. And no man acts untill he thinks about it. This is why you should take your thoughts seriously.
Phillipians 4:8 tells us to think about things that are true, noble, just, pure, lovely, things that are of good report. If there is any virtue and if it is praiseworthy, think of them. Anything outside these, should not take your time.
So, take charge of your thought, for thoughts have destroyed many. Know that what you see and hear has influence on you.