Need a little help how to talk about symptoms

So talking to this girl, and she wants to learn about my diagnosis. I genuinely don't know how to tell someone "Hey I don't trust people and no matter hard you try I will never trust nor feel safe around you". I've told this before, but they take it so personally and feel bad. I genuinely don't want to scare her away. Should I just not say it and act like normal? Genuinely lost, any advice?