I cannot perceive the difference in sounds of the words between worrier and warrior.
Do they sound obviously different to you? If so, I'm really hopeless at listening to english.

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The adult human brain doesn't pick up foreign sounds like children can. It will throw out or modify any sound that doesn't resemble Japanese because that's your native language and that's what it expects to hear when listening for speech. You'll have to listen to maybe a thousand hours or more of English before your brain starts to pick up the difference between 'worrier' and 'warrior :(