If you are taking the shower before your wedding during the dream, it means that you are leaving your past away and wish to start a new clean and clear life. You are ready to enter into new life.
Dream dictionary: Wedding shower dream meanings
If any one dreams of this abode of the blessed that he or she is ascending to Heaven, or is already enjoying its delights, it shows that some joyful event is to happen, such as the birth of an heir to childless people, good fortune to those who are poor, distinction to the wealthy, and high honours to the ambitious. If lovers have such a dream, it foretells an early marriage under the most auspicious circumstances, and that their wedding will be attended with troops of congratulating friends, who will shower presents upon them.