To dream that you are mixing something, signifies a blending of opposite ends of your personality. You are trying to be more yielding and more flexible. Alternatively, you are trying to combine different aspects of your life and keep everyone happy at the same time.
A mix, or mixing substances together, can represent:
The idea of mixing whatever the substances represent, and the results that would follow
Creating or creativity, where elements or ideas are combined to create something new
An activity or procedure that involves mixing, such a baking or painting
Synergy, cooperation, or compatibility among two or more elements, people, groups, etc.