I think you may not realise, but actually most people your age have no idea what they want to do. Most who say they want to do this and that have actually no clue and are just trying to cover that fact up. I was the exact same. Only recently did I decide on what career I want to pursue (I am 20 now).
I mean most of my friends went off to university to study a random ass subject that they didn't even know whether it would benefit their future career path or not - (something which i would greatly advise against).
You're so young! You shouldn't feel as though the moment you turn 18 you have to go off and start your career path. You have so much time ahead of you to figure it out. Honestly focus more on discovering yourself as a person than what career to choose. Focus on what activities you enjoy the most. I've noticed you posting in the god and skin concept section, so I'm guessing like myself you are a creative soul. Figure out what creative processes and outlets you enjoy the most, and everything will come to you I promise.
And just realise that you don't need to have the perfect job with the perfect salary to find true happiness. I mean I know many people who just work in coffee shops that love their lives and their work.
Now here's a compilation of inspirational images: