What you didn't learn in school: Working for yourself you'll spend less time doing the thing you love
Yeah, I know this sounds cynical but it's also true. When you make the decision to work for yourself, either freelancing or running your own company, you’ll end up doing less of what inspired you in the first place. That’s not to say you won’t learn to love all the new skills and duties essential to running a company but you can expect to spend 75% of your time finding work (and everything else related to running a business) and 25% of your time getting your hands dirty with creative work.
Is the autonomy worth it? For some entrepreneurial folks, of course it is. But some people would rather focus on making stuff and letting others handle the contracts, invoicing, biz development, etc. What kind of person are you? In either case, there are tons of tools out there to help you manage yourself and your business. Find and master the business tools that let you spend more time making stuff and less time managing stuff.