There's help out there! (And here--I think at the very least the experiences and knowlege of the combination of all us just might add up to one fully confident adult! lol) Just ask.
Credit cards are a huge one! I think we're going to go cashless as a society eventually. Collect those points!
Seriously, the best advice is to ask those handling things for you now questions and have them teach you what to do/they do now while you can. You don't need to take over right away, but knowing stuff before you're forced to do it will save you a lot of trouble. Once you know what's what, you can transition at your leisure.
A parent's job is to make/educate fully functioning adults that can continue without them. It should be goal of society too when you get down to it.