I've changed careers 3 times - and learned 6 critical lessons about work and life

Like any worker, over the years, I've built up a body of knowledge relevant to my work. Switching to a totally different line of work rendered a lot of that information essentially useless.

But one thing that is always applicable from one career to the next is experience.

The abilities I honed, like being able to educate myself on previously foreign topics, work with multiple different personality types, and manage several projects simultaneously, have been a priceless and compounding asset.

In my days at the entertainment agency, I had six or seven close friends in the office, and I was close with a handful of people who worked at other companies in the same industry.

We hung out at each other's homes, went to bars and shows, and played beach volleyball every few weekends, too. At work, the jokes and chatter were constant.

But within a year of leaving the entertainment industry behind, I was only in meaningful touch with four or five of these people. And now, years later, though I am loosely in touch with some of the gang, only one former work friend has become a genuine, lifelong friend.

Read more: I'm in my 30s, and I've completely changed my mind about 5 things since I was in my 20s

I was surprised and somewhat saddened that I lost touch with some many people in such a relatively quick time. But I'm also clear-eyed about it. After all, it's not as though I was constantly finding time to head downtown for lunches with my work friends, or making plans with them via phone or email, as opposed to just leaning into an office as I walked past for coffee.

I understand that a workplace needs to have certain systems in place to keep people on the same page and keep operations running smoothly.

But now with an outsider's perspective, I can see that many companies have gone too far in how they control their workers.

In my last regular position, if I wanted to take a personal day or even a few hours off to go to the dentist, for example, I would need to fill out at least two forms have have a multi-step back-and-forth with HR. Taking a longer vacation? That required planning weeks out.

I remember once feeling genuine guilt for having to leave in the middle of the day as I was overcome with a high fever. I would think: "Sorry, listen, my vision is swimming and I'm sweating and shivering and I can't really think right now. Is it OK if I head home? Sure, I'll find someone from the mail room to cover my desk before I go — that's exactly what I want to be worrying about right now."

These days, I work for about six hours a day, sometimes five.

But I get more done in any day now than I ever did when I worked full-time for a company. Sometimes I get more done in a day than I did in a week.

That's because working from 9:30 a.m. to 7 p.m. for several years taught me how valuable time really is. So now when I sit down at my desk, I'm laser-focused and I work with only a few short breaks, like going upstairs for a cup of coffee and a piece of fruit.

That way, I can get done what needs to be done professionally and then get to all the other things in life.

After working in Hollywood agencies for so many years, I made a conscious choice not to ever work in that field again.

But had my first real career not been cut short by my boss' corruption scandal, I'm not sure I would have ever quit, despite my lack of passion for the work. The pay was good, but the fulfillment wasn't there, and that's a toxic combination for wasting years of your life.

Only once the rug was pulled out from under me did I realize I wasn't where I belonged. It took switching careers to recognize that.