I drink about 4 liters of soda everyday day. What will happen if i continue this?

Everyday for the past 2 years all I drink is soda. I can't stand to drink anything else because it doesn;t help my thirst. I've tried drinking water and juice instead but it just fills my stomach up and ill still be as thirsty as before. The only thing that will stop my thirst is carbonation. I'll go threw a 36 pack of pepsi in two days tops, and I drink about 2 of the 2 liter bottles a day, sometime more!! However I would just like to know what will happen if I continue to do this?