University prestige doesn't matter at all in my experience. Unless you go to a pay-to-get-degree uni, your grades matter more. And all of that is worthless after you get your first job, because then its experience from there onwards.
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I don't even know what half of that shit is and my life is going alright. So I doubt you are doomed.
Depends on the country I guess.
But I would say: nobody cares as long as you have the paper to prove it. And most of the time they won't even look at that proof.
What you will miss is experiencing a different culture. But if you plan on staying in your country - you don't necessarily need it. (It is always better to know more about other people - but it isnt crucial to success)
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