I am having white and smelly dacharge? why?

Infection: You have a vaginal infection, possibly yeast. Could try otc like Monistat (at least 3-day) first to see if resolves situation. If not, see your dr/ gyn or urgent care for exam and treatment.

Malodorous D/C: If you have a change in color, texture, odor or amount of vaginal discharge ; problems such as pain, itching burning with urination or sex or redness/swelling then it is best to see your gynecologist for evaluation ; accurate assessment.