Try your best to stay out of peer pressure.
Try to maintain your grades (it'll pay off I promise)
But other than that, you'll be fine.
Those are just stereotypes of being in high school and shit.
It's really no big deal.
Although you will be hated by upperclassmen because freshmen are generally viewed as stupid and immature and just ... .stupid.
Which is 70% right since some upperclassmen have grown a little bit of some brain.
They wont do you any harm.