To dream of hiding can mean you are ashamed of something in your real life. You may have a low self esteem, or wish to hide something which makes you uncomfortable. For example, you may be having financial problems or other difficulties.
The dream of hiding away can also mean you are moving in social circles beyond your humble means and you wish to conceal the truth from your contemporaries.
If you have psychological issues like being shy, anxious, low self esteem, difficulty in communicating or other problems, you may dream of hiding because that is how you cope with your issues in your daytime.