Hey OP don't worry you will be fine. I was around your age when I was driving a nice car to school. Most of the idiot kids that crash are driving rustbuckets or normal cars, do you guys ever watch the news? I have always had nice cars, some peoples parents here don't give them jackshit and they are the ones hating.
The guy that wished you would crash works as a waiter and drives 325i....he couldn't even afford tires. "Baller on a budget".
The other guy that claimed he worked for 7 years to pay for his "own" cars most likely has no college degree, he will realize how stupid he was once he gets a family.
Enjoy the car, just be responsible. Invest in a radar as the "first" mod. Don't use at a tool to go fast but as a tool to learn where the cops like to hideout....even a 80/65 at this age can fuck you over until you are 21.