To dream that you are in a cult suggests that you are in some destructive and/or manipulative relationship.

You are being exploited.

On a more positive note, you have the desire to strive for a better self. It implies devotion and sense of community.

To see a cult in your dream indicates that you are lacking any spiritual freedom.

To dream that you are a leader of a cult signifies your authoritarian attitude. No one should question your motives or choices.