if you're really not ready for college, don't go, if you're not committed, i'd suggest against it. You will just waste money (trust me, i've been there)
have you thought about taking a year off before making the decision?
and those saying you cannot live off skiing, that's very true to some extent, however when you want to live off it, most people think you want to be a pro skier which is indeed pretty hard.... you can however make a modest but good life of skiing if you're willing to work hard for it and work skishops, be a liftie, skipatrol, maintenance crew, whatever... it's not going to be glorious but you'll come around if you work for it and you'll get a lot more days on snow than you have probably ever had before ...
and as for the future, yeah, for me personally that's the hardest part, right now i'm getting around doing all the stuff i do but the future is a big question mark, ie. what am i going to do once i'm 50 or something ...
but even then if i look at the people that surround me now and that i work with daily or that i know are living the mountain life, there are plenty that are over 50 and are very happy with their life ...
so i can't speak for you in general, but yes for most people it's the right decision to sack up and do college, for me personally, i've wasted 4 years of my life on something i didn't want to do and i regret not having followed my heart ...