I recommend that anyone considering starting a business read a book or two that will provide a look at the reality of business ownership. Way back when we read "In Business for Yourself" by Bruce Williams, In Business for Yourself: Bruce Williams: 9780812840117: Amazon.com: Books
, and it convinced us that we weren't ready yet and would be happier working in an established company.
I'm more entrepreneurial now, but I probably still won't start a company because, in my opinion, you need to be ready to commit 100% (i.e. be ready to lose everything) to have a great chance at succeeding. I'm so close to retirement now that the risk/reward doesn't work.
One thing you might want to explore the possibility of moving to a more entrepreneurial environment. That is what I'm in the process of doing right now and it feels like a weight is being lifted off even though my responsibilities (and potential stress) will greatly increase.
Also, don't even think about it until you have a solid business plan. Having it vetted by someone with business and/or start-up experience really helps also. Your local chamber or university should be able to help with this.
Finally, don't rule out buying an existing business. It seems that your situation is more about not working for others than starting a business from scratch.