Whether it feels like it or not, you ARE adulting! Adulting is making costly mistakes. Adulting is never being sure of whether you have done the right thing, and learning from your mistakes. Adulting is learning which people can be safely ignored, and which ones you should probably listen to. Just because someone is older than you doesn't mean that they are wiser.
For the record.... what do I know? :) Advice is based on personal experience, and that colours EVERYTHING. Keep what you like, discard the rest.