Would you consider caffeine a gateway drug?

I like caffeine. I don't usually have any or a lot (don't want to build up a tolerance), but, I'm kind of a binge drinker when it comes to energy drinks. It really worries my friends. And yeah, I know too much caffeine is bad, but I feel so great and full of energy (duh, energy drink). I used to have about 800-1,000 mg of caffeine a day, because I had built up that much of a tolerance to it. That was a couple years ago though, now I just have caffeine occasionally. Like, one time I drank two cans of nos, and another time I had 6 cans of monster in like, a two hour time period. I didn't crash though, it was great. But anyway, my friends keep telling me caffeine's a gatwway drug, and I'm probably going to start using more obviously harmful drugs now. Is it?