Fortunately there are no rules for what you are supposed to feel happy about. If you are convinced that being an employee means you should not be happy, then that's a (painful) psychological trick as well. Even if you run your own business, you still have customers to satisfy, so are they in control of your life? Regardless if you work for yourself or not, you are always working to provide value to someone else. You are always selling yourself; your abilities & time.
Or, to put in even another way, Life.
In contemporary society, things are nice enough that people typically trade a fraction of their time in exchange for work, income, and reduced risk exposure. This is a nice comfy abstraction over the cold reality that you need resources to live and you need to work and fight to keep living.
The alternatives to this are: a) socialism/communism type deal where the government controls your work output and resource provision; even if it works out (it usually doesn't), you have far less control than you do now. b) unspecialized agriculture-based society; every second of every day is spent producing just enough food and material goods long enough for you to raise children that take over when you die. Your options are limited; you are perilously exposed to acts of God (what happens if the crop fails?). You are not in control. c) hunter-gatherer setup; you are still not in control of your own life. You have no option than to spend the vast majority of your day seeking food (without agriculture you really do need to spend almost all of your time on that work). Ask one of these people what a 'weekend' or 'vacation' looks like.
The reality is, modern society gives you many more options than were possible even 100 years ago. International (and even local) travel is commonplace; you can choose to start a startup or work for yourself; you can choose to buy or not buy hundreds of thousands of products, many of which were not existing or even possible in the recent past; etc. You can even choose to leave it all behind and live on the land.
Don't confuse dissatisfaction with your own life choices with lack of control.
Keep in mind that the fidelity of the simulations will only improve with technology (e.g. VR.)
I'm not even 100% on this theory and it's one of my least researched so there's plenty of room for someone to come and slay me with data but I think the discussion definitely needs to come from a place of "pre-agricultural humans living their pre-agricultural life while ignorant of modern life" compared to "modern humans living their modern lives", rather than one of "well why don't you just go live in a forrest if you like it so much!?"
AFAIK most aboriginal tribes are quite peaceful. Rivalry with other tribes around territory and food sources lead to fights that look closer sparring and rarely lead to any wounded.
But if organization acts immorally and increases profit through unethical methods, it drains motivation and makes employees a lot less inclined to put effort into 9-5 jobs.
An average peasant in the feudalism had more free time than an average 9-5 office worker now.
In fact, the 8 hour work day is a recent feature. When capitalism arrived initially, it was much worse.
The rest of your post shows that you had an easy life, and I'm happy for you. But don't assume everybody can start a startup, travel etc. That's just not the reality out there.
If you want the lifestyle of a medieval peasant, you can do that now. No one is stopping you.