To dream that you are late suggests apprehension for change in your life. It also indicates your ambivalence about conquering opportunities in real life situations.
To dream that you are tardy projects your feelings of unworthiness. It also means you get a sense that people do not support your participation in an endeavor; perhaps they do not see that you are mature enough to handle the problem. Moreover, you may be overwhelmed or hesitant about certain choices you should make that will affect your future.