You are essentially defining self-confidence as a measure of how useful you are to others. That looks really strange to me.
Off the top of my head I would probably specify self-confidence to be a function of three variables:
How powerful do you feel
How competent do you feel
How much do you think is at risk
Accordingly, to become more self-confident you should acquire more power, become more competent, and manage your risks.
You are essentially defining self-confidence as a measure of how useful you are to others. That looks really strange to me.
Off the top of my head I would probably specify self-confidence to be a function of three variables:
How powerful do you feel
How competent do you feel
How much do you think is at risk
Accordingly, to become more self-confident you should acquire more power, become more competent, and manage your risks.