If you dreamed of being involved in a game of tag, the meaning depends on how you enjoyed the game.
If you had fun, you can anticipate good times ahead.
If you were frustrated because you were “It” and couldn’t catch anyone, you are having trouble in real life overcoming a difficult goal or task. Perhaps you are not getting the attention you want from a crush.
If you dreamed of being the one who was chased, or if the game felt scary or unpleasant in any way, you are avoiding facing a threatening or unhappy situation in your real life.