Can i buy a car and buy insurance all on my own if im 17?

Im 17yrs old and im wondering if i can buy a car ? like do a trade in i have an 03 trailblazer wich is worth 5000 in trade in value the car i want is a 2000 audi A6 can i do this because of my age? im turnning 18 in 3 months? What about insurence? can i get insurance? on my own?