Kinseti's dad grew up in a time where it was easier to get by without a diploma. School was not considered important at all until the 50s and 60s, and there were plenty of openings available for jobs which did not require a diploma or degree for a long while after that, especially in industries such as the automotive industry.
Nowadays, a university degree is the equivalent of a high school diploma, and you need at least that to get anywhere in a professional career. It's possible to live. About 33% of Canadians do not graduate high school, according to a StatsCan statistic I saw in class a couple weeks ago. However, you will almost certainly be part of the lowest social class and will not be able to afford the standard of living I imagine you're used to since you have a computer and an internet and post on a forum about an independent video game.
I want to be an artist, too (in different forms than yours). But I'm getting an education anyways. Admittedly, I am majoring in Drama, so I still pursue an artform, but I'm also receiving an enriched experience on the world and developing critical thinking skills which will help in all aspects of my life. Also, it allows me to think in ways that differ from how I thought before arriving, and discover new things about the world. If only 20% of the world went to college (And surprise, I think less than 20% of the world gets that opportunity), the world would be a worse place. The ideal is that 100% gets to go.
My advice to you is to go to university, and enrol in an Arts program. Not because it's easier, but because Math, Engineering, and Science degrees don't actually teach critical thinking skills (even though everybody who has them think they do), and because money-degrees aren't actually really great for making oodles of money with (though, not all Math and Science degrees are thought of as money makers). The market is going to be flooded with engineers in the coming generation. There's already too many.
And you can take a course in sculpting. Or, at some universities, get a degree in Independent Studies in Sculpting.
University is better than High School in every way. Hating High School is a bad idea not to try a university.
Ninjas:
Rooster: Being from Poland might change things. Probably not, though, since you're still not in a country where corporations go to outsource their unskilled labour. You'll be more likely to find a job doing whatever with education than without, however. Your employer isn't going to look at your resume and go "Ha, what an idiot, getting an education. Okay, let's go with the high school drop out". As to your question: That all depends on the nature of the industry you're in and the economy in Poland. If you wanted to start your own sculpting business, you'd need to do all sorts of things, you'd want some working capital, and in North America you wouldn't be able to expect a personal profit for 5 years. In Canada (probably the US, too, not sure), you would be able to get loans because the government likes it when you form small businesses (right now). Maybe, if Poland is trying to bolster the economy a bit (as I imagine it must be), you could get a loan like that, too. You'd need a business plan, though, and good luck doing it on just sculpting.
If you just want to be a freelance sculptor, I would say you have a very miniscule chance. It is rare for artists (of any sort) to make a living doing just one thing. In theatre, for example, actors are often known to do stage management, tech, writing, directing, etc. to find work. You probably know more about sculpting than I do, though. Are you a skilled sculptor? Is there a particular demand for sculptures in Poland? Eastern Europeans dig statues, right? We don't have many here younger than 50 years.
Forsaken's Ninja: Yes, Forsaken raises a good point. The military is a great career opportunity. I know many people who have succeeded this way. However, your world-view seems to be against this. If you ever change your mind, give it a go.