You dont magically turn into an adult when u turn 18, just legally. It can still take years depending on the path you might choose. Per say, since i am in medical school, i will be a student for a much longer time and still have to depend on parents for a while.
As for other, non-financial responsibilities, i am not proud to say but i didnt rly help around when i was at home. Only started doing the laundry, cooking on sundays, etc etc after i moved abroad. These stuff i think kids should learn to do when they are young tho, so it wouldnt be so hard for them to get into it later on like in my case.