The first thing that we need to discuss is your self acceptance. Many of your reactions are based on your idea that you're unworthy, that everything wrong with the world is your fault, and any unhappiness in anyone around you is also your fault.

The situation is not helped by your parents. Are they not divorced or broken up?

It seems to me that the childhood incident is not so much an incident as a series of them.

I suspect that you need to discuss your parents. One of them blamed relationship problems on your presence?

That's what I'm getting out of it all. And although you weren't old enough to consciously understand, your subconscious absorbed this idea that your very existence creates a problem.

You may be able to free yourself from this debilitating believe with affirmations and exercises in self-love (not arrogance, mind you, just appreciating what's good about you instead of your obsessive focus on what you consider to be flaws).