What should I do if my girlfriend is too inquisitive about my life and I want to hide some things from her?

I am a pretty honest guy, but I want to hide my vulnerabilities because I have a certain emotional weakness from past trauma (childhood bullying). I keep working on it and I am resilient, but obviously I am not the most relaxed and carefree guy. My girlfriend keeps asking me questions about my life and she keeps implying that I hide things and says that I am too evasive

What should I do if my girlfriend is too inquisitive about my life and I want to hide some things from her?
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