I've never desired to own my own business because I consistently see how much work it is and how people screw it up.
#1. many operate under the delusion that they won't have a boss. Every person who walks through your front door IS your boss. If anything you have MORE bosses than in a traditional job.
#2. Business owners who I've known like one aspect of their job, and fall down in the other, necessary ones. For example, a veteranerian who hated humans. Well, it is nice to like animals, but they don't write the checks. Campground and hotel owners where the idea was that wife did the meeting and greeting, husband did maintenace. Guess what? You can't have a mean old sour dispositioned man on the premises, and what happens when wife gets sick. Exercise instructors who buy a franchise and can't handle paperwork and filing. After a couple of years, that paperwork catches up with them at tax time and trouble ensues. People whose spouses are cheating on taxes, and they just sign. And here would be a biggie for me, when the maid, waitress, etc simply don't show up and you have to do it all. Be sure that you can handle every aspect of the business because it IS your business. Your customers don't care that your maid didn't show up so it's ok that your restrooms are filthy. The IRS doesn't care that you just signed the piece of paper your spouse or business partner stuck in front of you without reading it. And who gets to deal with renters who don't pay. And do you really expect renters to be happy when you lost the check?
Think long and hard and be ready to deal with it all ... and yes, with a smile on your face, whether you feel like it or not.