Don't let nationalism stop you. You were randomly born in your country.
Choose your country. Don't let randomness and some emotional baggage control where you want to live.
You have a finite live. Make most of it.
People who move abroad usually leave everything behind: family, friends, etc. Yes you can come visit regularly, but what was previously a daily or weekly thing now becomes yearly or bi-yearly in many cases.
Second it's the language barrier: moving to a country where you don't fully master the language (sometimes far from it) is really hard, too.
In the US, most people I have met who immigrated came via chain migration, with family members sponsoring other family members’ visas. And things also supplemented by family members in those families immigrating via student/work/spousal visas.