There is so much pressure to be on the 'right' path. It's like we've all be taught to conform to one lifestyle. Go to high school, get good grades, go to college, graduate college, get a job, get married, get a house, have kids, save for retirement, don't change career fields, etc. Nothing is wrong with any of those things, but constraining success and training yourself to 'play it safe' is dangerous.
You are far too young, too smart and too important to play it safe. So you've always wanted to be a doctor, lawyer, second-grade teacher. But, now you've changed your mind, that's ok. You're not 'too old' to still have dreams or ideas. You can still be an artist, astronaut, full-time mom if you want to be.
You don't have to be one thing either. For the love of everything good in the world DO NOT, I repeat DO NOT 'stay in your lane.' Join theater even though you've always been an athlete. Learn an instrument, a language, a hobby. Try something new and be crazy. You have so much time. And even if you don't, you should spend every second loving what you do, and more importantly, loving who you are.
Screw playing it safe. Quit your job, change your major, study abroad, do that thing that you've always dreamed of and pushed off into the back of your head. Seek some adventure, a thrill. Discover something that makes you feel oh so alive. Pick up a paintbrush, a boxing glove, a camera and enjoy this life. There's so much life to live, so many amazing things to so stop being afraid of it.
Dream big, fail hard, rise more. Embrace failure like your kindest thing. Fall in love with things, fall out of love with them, but at least try them. You never know what you might find out there that is created for you to love.
You are never too old, too young, too inexperienced to try something new. No matter where you are in life you are too young to 'play it safe.' What's the point of being comfortable if you never did anything worth talking about?
You need stories to tell, memories to hold onto and passions to keep you going. So get out there and find them. You were not made to be mediocre, comfortable or restricted. You were made to be extraordinary.