What is a secret you rarely mention to someone you are interested in until they have known you for a while?

Is there something you just don't tell people because you are afraid of being judged for it? Either a secret from a close friend or something you don't want your significant other to know about.
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You are able to answer this question anonymously or feel free to message me if you don't want it publicized at all. Just looking for some good secrets to use in character development.
What is a secret you rarely mention to someone you are interested in until they have known you for a while?
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