What happens if you drink alot of coke?

i drink about just a bit more then half of a 1.25 coke a day maybe a full one ive only started that at the begining of this year but even before that i drank coke everyday ive drank it sence i was like 4 but not every day when i was 4 lol and im 15 now but im not fat but will anything happen to me oh and i drink it everynight b4 i go to bed coz helps me get to sleep XD