In the past month or so I've done all of the following
1) Voted
2) Paid rent with my own money on my apartment I rent
3) Bought several six packs of beer and some whiskey at the store with my own ID and money
4) Purchased a pack of cigarettes with my own ID and my own money
5) Drove my car which I purchased and pay for with my own money
6) Went to my full time job
7) Spent zero time at school and consequently did zero homework a teacher assigned to me
8) Am over the age of 18
If you can't say the same for basically any of these you are a child.
Debate over. Carry on.