日本語 Japanese Ask Questions Thread 8

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英語でも日本語でもOK
日本の方からのご協力も大歓迎です

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Can somebody please explain me about だけで（first one） in「そんなの自分だけで分かったつもりになってるだけなのよ」 I'm not sure what meaning does it has in this sentence. Some sort of translation "Also, even if say "the true wish" it's only that 'you are the one' who thinks that understood."

どうもしなくても大丈夫。わたしに任せてくれればそれでいいのよ
それにね、本当の望みなんて言っても、そんなの自分だけで分かったつもりになってるだけなのよ
不幸も幸せも、苦労も泣いたのも辛い楽しいのも、全部私が用意してあげる