I plagiarized my way all through high school and college and won a EUR10k scholarship
Can I ask why you plagiarized?
I plagiarized because I never thought there was anything wrong in it.
I hope you feel differently today.  Plagiarizing is cheating and you won your scholarship by dishonest means. You should recognize that you won something that you didn't deserve.
I feel no shame. I was the best plagiarist in school.
I can see that you got away with it, and actually benefited from the plagiarism, but that does not make it right.  You essentially used someone else's own work and took away a scholarship from a student that truly deserved it.  Even if you can't undo that decision, you should at least own up to what you did.