Your sense of who you are determines what you perceive as you needs and what matters to you in life and whatever matters to you will have the power to upset and disturb you. You can use this as a criterion to find out how deeply you know yourself.

What matters to you is not necessarily what you say or believe but what your actions and reactions reveal as important and serious to you. So you may want to ask yourself the question what are the things that upset and disturb me ? if small things have the power to disturb  you, then who you think you are is exactly that small.

The world always makes sure that you cannot fool yourself for long about who you really think you are by showing you what truly matters to you. How to react to people and situations especially when challenges arise , is the best indicator of how deeply you know yourself. The more limited the more narrowly ego the view of yourself the more you will see. Focus on & react to the ego limitations the unconsciousness in others.

Who is looking at the ego? The ego in you.