To dream that you are watching someone means that you should consider what you are hiding yourself.
Voyeurism Dream Meaning
Voyeurs are typically afraid to face their own sexual needs and desires. They find themselves feeling ashamed and embarrassed by them. As a result, they tend to hide themselves from relationships.
[1]Voyeurism Dream Interpretation
1. Disassociation from desire, affection—often emotional.
[2]2. Shyness, afraid of intimacy (to watch).