Don’t know where to go

I’m going to enlist soon after my 18th bd but I want to be a pilot and that’s the goal but it’s rlly not achievable but the goal here is to be a sniper and I have no idea how to even get there and like if Yall can give me some steps to help me once I get in. Also can Yall give me an estimate of how long from when I enlist to when I become a sniper is like I wanna know how many months or something. And if u think I can like idk if this matters but like I’m 6ft 220lbs or smth so yea thank yall