What’s the source of your distrust?

I think for me the answer is my family. More specifically, my brother when we were growing up. My mom and her sister were close and my aunt had 2 boys same ages as my brother and I. The older siblings would always mess with us youngsters. They’d prank us and push us around, make up stuff just to mess with us. This may have been the earliest source of my distrust - and the need to question. Later on my brother would lie to me about various things which made me distrust him even more. One particular time in high school (before I could drive - so this was probably 13-14yo), I was late for the school bus and couldn’t find my shoes. It was the only pair of shoes I had so I couldn’t go without them. I asked if he took them (he’d been known to wear my stuff before) and he swore he didn’t. I asked again several times what he did with them because I never misplaced my things, and once again he swore that he didn’t touch them. I didn’t buy it, so I went outside to look in his car and sure enough there they were. At this point I was already too late and wasn’t going to make it. I could see him having fun with this situation at my expense. This moment has never left my memory and may have been the catalyst for a strong sense of distrust in anyone.