There's a big distinction between people's self-image and their behavior. One's confidence in telling a story doesn't come from its adherence to reality, but from its internal coherence. It's why, in user interviews, you stay away from questions like "how do you generally use feature xyz?" but rather ask things like "tell me about the last time that you did xyz". If you ask the former, they'll essentially tell you about their self-image, and how they think of themselves, and with the latter they'll tell you something that actually happened, and they're much more likely to tell you something real about their behavior. It's an unavoidable aspect of talking about yourself, and I'm not calling anyone a liar, but it's something to keep in mind when talking abt stuff like this.