What Advice Can You Give A High School Senior?

Because being at the end of high school feels like standing on the edge of a cliff.

Unfortunately, you can't actually go back and give advice to your high school self. Here is your chance to possibly make a difference in a random teenager's life. Without telling you my whole life story, I am a 17 year old girl who will graduate from a suburban, public high school this year. In the fall of 2015, I will most likely go on to a public four-year college; however, if other opportunities arise, I would not be opposed to taking them.

My question for you is: what advice would you give to a teenager who about to graduate?

(and I will not, under any circumstances, take ("just give up") as an answer; you can say it, but I won't be listening.

Also, my apologies for any incorrect grammar; I know I have have a comma problem.