Sun Square Ascendant
The sun represents our vitality and our conscious ego, the self and its expression. It establishes our will to live and our creative force. It is associated with spontaneity and health. A well aspected Sun will describe a person who has heart, who cares for others both in general, and at the personal level. A poorly aspected Sun will describe a person who either has much more difficulty accessing this love and caring ability. In your chart the position of the sign represents your life purpose and style in which your make your mark in the world.
Sun Square Ascendant
With the square between your Ascendant and Sun it may indicate some conflict between the way you express yourself, and your sense of self-identity. There may be a feeling of blocked energy, and a sense of frustration that you do not come across to others as you really are. Your attitude may be quite harsh or misunderstood, and it can take some years to develop your personality, so you don’t tend to upset other people or come across as overbearing or offensive. You will compromise when there is no alternative.
It is hard for you to accept that you may be wrong or that you need to improve yourself, which makes this aspect very difficult to transform. Firstly, you must accept that there may be a problem and have more awareness around your interactions with others and listen to their perspective. This attitude may have a lot to do with your relationship with your parents perhaps they could not express themselves well or you couldn’t communicate with them in a positive manner. Awareness of this important, otherwise the defense mechanism can worsen over time, and natives of this aspect can meet with problems in your career and in personal relationships. Softening the manner and the attitude does wonders to smooth over relationships of all kinds. If you realize that it's not your abilities but the way you express yourself that offends people, you will succeed in your goals and be rewarded for your efforts.