Sun square Sun transit can represent a crisis in confidence because of challenges from events or other people, most often from men or bosses, teachers, etc. They are testing you and your goals, forcing you to justify your identity and what you are doing.
Your ego is on the line, coming under pressure from others through arguments or challenges to your authority. This may be a reaction, as they feel you are too pushy to assert your will over them.
This is not a favorable time for getting your way, certainly not if you want to maintain harmony in important relationships. Over-assertiveness may upset others and cause added pressure on you.
This interpretation for Sun square Sun transit can also be read for a Solar Eclipse and New Moon square Sun.