I've signed up, then withdrawed out of college 3 times.
And I don't want to work for anybody my whole life.
Oh, you hate working? There's a club for that. It's called "everybody." They meet every Friday down at the bar.
Welcome to adulthood. This is the part where you put on your big-boy pants, suck it up, and do what needs to be done.
Once I'm able to save a down payment for a house (20,000) I will get one and later use a mortgage against the house to buy a business. Is this a good strategy
To be frank, no, that is a terrible idea, for many reasons. For one thing, you can't take non-existent equity out of a house. So you're relying on the home going up in value (how'd that work out for everyone in the US who bought a house between 2008-2010)? Secondly, that's called "leverage," and it's a way of ramping up the risk in the hopes of a bigger payoff. Thirdly, you appear to know nothing about running a business, and have demonstrated a difficulty with learning. How will you start a profitable business, or know how to select one to buy? How will you manage employees? How will you ensure your business is complying with all relevant state and federal laws with respect to accounting, taxes, accessibility, equal opportunity, export/import regulations, and everything else?
Basically I wan to be financially independent and be able to live an enjoyable life. Did I make mistake dropping out of college?
Research does show that there is a link between lifetime earnings and higher education. That said, there are plenty of successful people who never went to/finished college.
What you require is a strong work ethic, a willingness to learn, and a good plan. But levering up on residential home debt to buy a heretofore unspecified business is not a good plan.