I like having a "home base" to come back to, a place where I can count on things being a particular way. It's also a good place to keep clothes that are currently out of season, send your mail to, visit a nearby dentist, etc.
Home base could be the house you own... though you don't want to be paying a lot for a place you seldom use. Consider renting part of it to a person you can trust and keeping a room for yourself. The rent you collect will help defray the costs. Alternatively, rent the whole place and find another place for yourself. It could be a room in your parents' house or a room you rent from a friend. But make sure it's a private room and that the financial arrangement is agreeable-- you don't want to wear out your welcome by being the couch-surfing moocher who drops by when there's nowhere cooler to be.