I think I realized I was a grown up was when I moved into my first apartment and had to start paying my own bills. I also think the reality came when I started my big boy job!
Now that I have been on my own for sometime now and I am married, I think that having to do everything like laundry, cleaning, and mowing the grass make being an adult all too real.
I hate that on my days off i find myself staying busy with task to do around the house. Sometimes I am more tired on my days off then I am when I have to work.
Being an adult is awesome and I would not trade the responsibility for anything!