Assertiveness is a helpful skill in life, yet most people do not have it. They do not have it because they could not learn it at home or from anyone else except professionals. You see, the people who teach assertiveness must be very confident and not afraid that you might use assertiveness with them, and these people are hard to find.
Am I assertive all the time? No, not really. Sometimes, I choose avoidance or aggression, and every time I use them, I feel uncomfortable. They either hurt me or others, which is not very good. Still, I aim to use assertiveness in my communication with others and most of the time, I do.
Assertiveness requires confidence to express your own thoughts and feeling without fear and without the need, desire or intention to hurt anyone else. It is important to distinguish between having the intention to hurt and actually hurting someone else.