How much will it take to get diabetes?

how much unhealthy habits will it take to get diabetes? for example if i drink 15 bottles of ginger ale in a week, it's only this week that this has been done, that isn't my regular habit. will i get diabetes right away? by the way i'm only 15 and i'm a perfectly healthy, normal weight, but not a very active boy. however i've gone into a total paranoia about may this or that have me getting diabetes, it's a scary thing for me.