You seem to be fixating on the question of why you struggle with insecurity to the extent that you do. It's a good question, though if you look around at the world and notice how much is teetering on the brink of disaster, you would feel better about yourself. We in the 21st century often think of ourselves as being so much better off than the pioneers or the settlers or assorted primitives who came before us. But is that really true? There's so much more that can go wrong today. For you, though, the question is where you place your focus or, as may be the case, your over-focus. Because the things that concern you and consume your energy so rarely go wrong, you can read your own thoughts like a tarot spread. You don't actually need to worry about what you tend to worry about, though it will tell you a lot. There really is a root cause to your worries, and from what I can see you're in an excellent position to figure it out. I can give you a clue, which is that it's likely to be a variant on something that troubled your parents and perhaps their parents but is no longer a factor in your environment. Once you understand that their problems are not your problems, you will feel so much better.