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

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.

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.

And much, much more.

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?

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.

No freedom is absolute.

Insurrection

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Revenge porn

Threats of violence

Child pornography

The Apple AirPods Pro and AirPods 4 Drop to the Lowest Prices of the Year for Father's Day - IGN

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.

Insider trading

Revealing classified information

Elon Musk’s Neuralink closes a $650M Series E - TechCrunch

Fraud

Conspiracy

Freedom of speech does not apply to:

Mets place Mark Vientos on 10-day IL, option Max Kranick in flurry of roster moves - SNY

False advertising

Terroristic threats

Perjury

China says its exports to the US fell 35% in May, as trade talks are due to start in London - AP News

Trade secrets

HIPAA violations