If freedom of speech is absolute, how come it's not applied for private spaces and for the Internet?

Fraud

No freedom is absolute.

You have freedom to travel. If I loan you my car, I can tell you not to take it out of town, because it’s mine, you have no right to use it, and if I give you permission to use it I can tell you what you can and can’t do with it.

Why do I feel worthless most of the time?

False advertising

If you’re wondering why free speech doesn’t apply to the internet, it’s because you have no right to use other people’s stuff for free.

Threats of violence

What is your best gay fantasy?

Terroristic threats

And much, much more.

Trade secrets

Is it common for Americans to feel "trapped" due to the size and distance of their country from other countries/continents? Is this feeling an exaggeration or a reality?

That’s what it is. You have no right to use other people’s stuff. If people let you use their stuff, they can tell you how you can use it, and they can tell you to stop using it any time they want.

Conspiracy

Revealing classified information

* Underwater Smoke Signals: Humpbacks May Be Talking to Humans - SciTechDaily

Freedom of speech does not apply to:

Revenge porn

Insider trading

Will Miami’s latest effort at “culture change” work? - NBC Sports

Child pornography

You have freedom of speech. If I loan you my computer, I can tell you not to use it for certain things, because it’s mine, you have no right to use it, and if I give you permission to use it I can tell you what you can and can’t do with it.

Insurrection

Is dating in college necessary? Why and why not?

Perjury

HIPAA violations