"I'm really honestly terrified about how much I should tell and how much I should still keep secret"

This quote by Maureen O'Hara speaks to the trouble of browsing the balance between openness and personal privacy. It recommends that the speaker is having problem with the choice of just how much of their individual life to share with others. The worry revealed in the quote implies that the speaker is worried about the effects of exposing too much or too little. It might be that the speaker is worried about how their disclosure will be received, or that they hesitate of the prospective consequences of being too open. Eventually, the quote speaks to the problem of finding the best balance between openness and personal privacy, and the fear that includes making that decision.