People who have experienced complex traumas, how do you cope with impostor syndrome when talking about your experiences?

Growing up in an environment that constantly gaslight my experiences and downplay my achievements, most of the time i find it hard to believe myself whenever i talk about my traumas and knowledge i have about subjects that i am qualified for. I would always have a feeling that i am lying whenever i talk about something that actually happened, as my entire life growing up i had to keep telling myself “no it can’t be”/or “everyone in my culture have experienced it” (not everyone in culture have experienced it and i’m glad i had people in my life and childhood who helped me realized what i experienced was on the more extreme end of child abuse). This then rubs off onto my professional life as an adult where i often feel deeply insecure listing out achievements that i should be proud of - as i feel like i didn’t do it, even though there are evidence that tells me i did it and i did it well. I thought i could finally feel more confident in myself after doing a bachelor in psychological science, so i did it, still felt shitty. I thought a master degree in counselling would be better in helping me believing in myself, so i did it, graduated with a distinction, helped many clients cope with and get out of abusive environments, got amazing feedbacks from my supervisor, yet i felt more insecure and more like a con, even though i am at a stage of life where i am more qualified as a professional than i ever was. People who have experienced similar things, how do you cope with imposter syndrome?

People who have experienced complex traumas, how do you cope with impostor syndrome when talking about your experiences?
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