Water is often seen as a manifestation of purity and cleansing of dirt. Taking a shower in your dream may be indicative that you feel the need to wash away all the dirt from your body, whether it is physical or emotional. This symbolizes renewal and the desire to start fresh at a new point in your life. You want to forget all the emotional pain, stress, and pressure of life and by cleaning yourself with water, you feel that it will be wash away.
Taking a shower in your dream may also reflect on your requisite for forgiveness. You may have committed a deed which have cause pain and hurt to others around you. Thus, by taking a shower in your dream, you want to deluge yourself of guilt and remorse by seeking forgiveness.