I found my wife's shocking message after marriage. Please tell me how to deal with it.

First of all, if you are willing to face this problem, I believe you are a good man who values feelings. If you love your wife, you should pretend that you have never read text messages. She wrote it down because it was a psychological hurdle for her and a shadow across her mind. As you said, she doesn't like to be introverted. These are all young, because this unbearable past made her feel unable to lift her head and even feel inferior.