If you look at the mirror and see in it yourself while dreaming, then it shows your inability to face and accept yourself for who you are. Perhaps there are some issues you are delaying to accept, that is why the mirror appears in your dreams. You dont need to hide from yourself. The mirror that is smashed or crackled brings bad news about those you love. Prepare for the sorrow and depression.
Read more about dreaming of Mirror in other dream meanings interpretations.