I'v nominally worked for myself, as half-owner and company director.
I'm a huge geek, with mental health symptoms that could be mistaken for autism and ADHD but are actually due to trauma from having terrible parents who I removed from my life decades ago.
The customers were clueless disorganised nitwits. Their upper management was out playing golf, so we had to try to get their disgruntled office staff to stop looking at facebook for five minutes and cooperate with us to get things done.
I handled complicated technical stuff but had to leaving talking to the customers to someone else.
It depends on your personality.
I'm too honest and bad at manipulating people to be a good salesman or executive.
Sales is a totally different skill set and psychopathic personality disorder to making the technology work.