How badly is my health affected?

I am an overweight teen. I get over 1 hour of excersize per day. eat a diet high in proteins and low in carbs and fat. However i have a growing caffeine addiction. I either drink black coffee, or sugar free energy drinks. Some days my caffeine intake can reach up to a gram of caffeine. (Appx. 11 cups of coffee) ive grown a high tolerance to it. I have low blood pressure and my RHR is 77. How badly is this caffeine addiction affecting me?