Does "Ich hatte schon immer ein großes Interesse an Sprachen" = I no longer have any interest?
If so, how would would express that you've always had (and still have) an interest in languages?

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Ich hatte schon immer ein großes Interesse an Sprachen = i ve always had an interest in languages

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I've always been very interested in languages.
And the German sentence is perfect for saying just that.

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Out of curiosity: What makes you think it does?

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No. This sentence means always had a great interest in speaking. There is nothing negative in the sentence.