You Know there is a saying that goes, if you don't have any enemy within your territory, then an outside enemy can't do you any harm.

But then, do you know that this saying applies to your own self too?

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When you refuse to give in room for doubt to have a place in your mind, then no doubts from outside would get through you and cloud your mind.

If you create a strong mind for yourself, then they would be no one to pollute your mind with their words or opinion.
It's just for you to believe in yourself because when you believe in you, you don't need any other to believe in you. Even if they do, and you don't believe in yourself then you ain't going to come out with that expected result that they want from you. And in the other way round, when you believe in yourself and others don't, they will be surprise at your result due to the fate they didn't expect that much from you.
People don't have a say of what you become in life, Only you have.

You can decide if you want other peoples opinion to be a reality or, your own opinion about yourself to be the main reality.

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One of the greatest obstacles in life is your own fear, believe, opinion and doubts about yourself, because you can use it to define who you really want to be.

Fear of doubts, what others would think of you or the judgement they would give to you, shouldn't be something you should give in.

You are stronger than who you think you are.

You are bigger than the doubts in your head, thereby defeating it should be your goal.

Do not allow external little things that doesn't matter to be the obstacle that will hold you down from doing what you want in life, achieving your goals or establishing a thing of your dream.

External little things like; I can't, am not good enough, am not worthy enough, am not strong enough, am not intelligent enough and am too small, should be shoot down in your mind. You are extraordinary than who you think you are.

Failures might come. Yes, because those who attained greater heights did encounter failures.

Albert Einstein had failures in his life when growing up. He wasn't academically bright but was still able to make it by winning noble prizes and giving us laws that governs physics.

Charles Darwin had failures that he even dropped out of school twice from his medical career but today his theories on natural selection and evolution in biology is world known.

Thomas Edison the inventor of light bulb failed 1,000 times but he still didn't give up in the invention of light bulb.

So in life, failures are like obstacles. You have to overcome them to be successful at what so ever you do.