Even the most boring subject can be made more interesting by digging deeper. If you don't want to get stuck in a boring job, excel. Don't coast. What
Eaglewings said about doing what others want you to do is true but learn what you must in order to have the opportunity to learn what you want.
If you don't know what you want to do, you can learn a lot by volunteering. And, volunteering looks really good on your resume.
Just don't let the boredom own you. The less you do, the less you want to do and the less able you are to do what you want. It's a vicious circle and all you get is fat and diabetic.
Whatever else you do, take your time in marrying and having kids. A lot of people marry because there's no place else their relationship can go. Save your money and travel - which is an excellent education in itself and a fun adventure. You can stay home when you're old.
And finally, learn to speak, spell, write and look like what you want to be. You're restless, you want to be an adult because you believe adults have choices - right? The moment I read your OP, I knew it had been written by either a kid or a drop out. It's your choice but look around at what you like and admire and decide what it would take to get that.
And have fun.
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