DERMATOLOGISTS/P.As ONLY PLEASE!?

I am 18 years old and headed to college this fall. I want to become a dermatologist or a physician's assistant for a dermatologist as a career. If you are certified as either of these, I would really appreciate you talking with me about the schooling, what I need to be doing now to help me get into graduate school, and how you like your job. This has something I've wanted to be since I was about 14, and I really want to make sure I get the best head start possible for a successful future. I've looked online but it always helps to talk with someone with firsthand experience. Thank you!