As you might know, my son just turned 18. Its an age when you get a lot of privileges: you are able to buy alcoholic beverages, you can vote and you can be admitted a driving license among other things. It's a big change in life. You are no longer considered as a child in the eyes of society.
But it's not just all those privileges. It also comes with a lot of responsibilities. You are responsible of yourself and your actions. We are no longer the legal guardians for you. It's your duty to take care of yourself.
However it doesn't mean we are no longer there for you. We won't deny any help you might need along your way. We will still do anything we can to help you in your life.
It also doesn't mean you can do whatever you want. As long as you are living under our roof the same responsibilities remain taking care of our household. You still need to consider others living in there as well.
You have a long journey ahead of you. Eighteen might feel like a lot, but you are just getting started. Its just a new phase in your life. And it won't be the last big change there will be.