To dream that you are a rock star indicates your desire to be looked up to. You want to be admired and wanted. Perhaps you are lacking a sense of belonging or excitement in your waking life or you want to escape the mundaneness.
Alternatively, the dream maybe be a metaphor that you need to be a “rock”. In other words, you need to gain a more solid footing of a situation.
To see a rock star in your dream signifies the beat of your life.