I know the poor rationalization in women is rooted in two main places. One being the disconnect with spirit and the disconnect with their true feminine essence.
In our abundant male dominated society strength looks like it only comes in one form. Which is often viewed upon as the masculine form. Women from girl-hood see muscles, hear a deep voice, watch the forceful control that men dominate with and say to themselves 'aha that's strength'.
While that is one form of strength that is far from being the only type of strength.
Also strength is something that is both internal and external. While many women are mocking what they see externally as strength, they are internally weak or have detached from their core.