Like most things in life, there are pros and cons to school.
If you think working hard at school sucks, you're in for a nasty surprise. Working in the "real world" is probably more challenging, and depending on your job...sometimes a lot less pleasant.
There's also a lot more pressure once you're out of school.
If you screw up at school, you might end up failing a test or retaking a class at worst. In real life, you'll have to work hard just to keep up with paying the bills, keeping a roof over your head, and a bunch of other things you take for granted at school.
Also, school is one of the few times when you get to hang out with 40 or more of your peers, sharing jokes, having fun etc...
When you grow up, there are far fewer opportunities to bond with people in that way.
On the plus side, leaving school means a lot more freedom. You get to stay up eating ice-cream and watching Netflix all night.
There are also a bunch of adventures you can go on, rewarding things you can do, interesting places to see.
But remember, working hard in school is a great way to set yourself up for a more successful grown-up life!