Will I have any long term effects from drinking 15-20 beers over the course of a summer at 14 years old?

I heard that drinking at a young age is terrible because my brain is still developing and whatnot. I wanna know if that amount of beers over that amount of time will have any effect on my brain in the long run or make me like lose memory or something. I dont plan on drinking again til maybe 17-18 after i heard about what it does to your brain. maybe a few beers in the next 3 years but nothing as crazy as this summer