Becoming an adult too fast.

SORRY IN ADVANCE FOR THIS RANT!!! I'm 16 years old and I'm skipping junior year to be a senior. Instead of 4 years of high school I'm graduating in 3. I just signed up for the SAT. I've had a job all summer and basically have only come home to sleep. This school year I'm taking classes at the local community college. I just got a new job being a nanny for a special needs kid. (I basically do everything his mom should do for him). I just got to a really happy place in life and I'm starting to stress out again. Everything is happening so quickly. I'm only applying to 1 college because it's the only one  I want to go to. I'm starting to regret trying to grow up. Every time I talk to my parents about it they try and convince me to slow down and not skip junior year. I can't handle all of these emotions at once. HELP.