What I found to be the answer for self doubt.

I believe self doubt comes from being passiv.

When you go out to the world and talk to a lot of people and to a lot of judgments and maybe even negativity, the soul takes in this energy as a form of pollution. Anger, mistrust, envy and destructive judgment are like poison that we sometimes have no choice but to take in.

Knowing that, gives you clarity that you need to disinfect your soul from these toxic influences.

By calling God, the divine fire of the creator ((call the divine spark into your forehead)) and turning sincerely to silence, frequency (intentions) and vibration(mantras, spoken words, preferably sung sentences) the soul has a chance to purify itself and therefore its vessel.

After that cleaning process the soul comes to a state of fermentation, meaning the soul ferments and hardens the new state of equilibrium, arriving at a stronger, more robust and regenerated form of itself.

Know that your soul is the authentic you.

Call the creator and rest assured that he will burn away that which is not in his image.

Peace