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Are these sentences correct? I mean the clause with the present perfect. Or should it be the present simple instead?

I feel scared when I've been alone in a dark place.

I feel proud when I've taught someone something.

I feel embarrassed when I've done something stupid thing I don't want someone to know about.

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moody_mI feel scared when I've been alone in a dark place.

This suggests that you are scared afterwards, not at the time, which is a bit unexpected. More usual would be "I feel scared when I'm alone in a dark place."

moody_mI feel proud when I've taught someone something.
I feel embarrassed when I've done something stupid thing I don't want someone to know about.

These are OK. The feelings of pride/embarrassment follow the actions that you describe.

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moody_mI feel embarrassed when I've done something stupid thing I don't want someone to know about.

Sorry, I misread it. It should say "something stupid" or "some stupid thing", not "something stupid thing", as I'm sure you know.

Also, consider whether you mean "anyone" rather than "someone".

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Comments  
GPY

Thank you very much for the explanation.

 GPY's reply was promoted to an answer.
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