English version

retreat into yourself/your shell/fantasy etc

From Longman Dictionary of Contemporary Englishretreat into yourself/your shell/fantasy etcretreat into yourself/your shell/fantasy etcTHINK ABOUTto ignore what is happening around you and give all your attention to your private thoughts retreat
Examples from the Corpus
retreat into yourself/your shell/fantasy etcI retreated into my shell, being painfully shy in the first place.
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