Replying to Caffeine Addiction

Hello everyone,

I am a college student and I used to not drink coffee, however pretty recently I have started to get into it. And the affects that I get from the caffeine are pretty good; I usually just become more alert and stuff. So it can be pretty helpful. I usually only have one cup every other day. I am wondering though if anyone has any personal experience with caffeine addiction? also will having a cup of coffee every other day cause me to become addicted to caffeine sooner or later?

TL;DR
what is caffeine addiction like?
how much coffee will it take to become addicted to caffeine?

Thanks lots to everyone!