Much of what all people struggle with is from events that have happened in life.
Another large factor in what we struggle with is passed onto us from the genes we inherit from our parents. IE illnesses - including bipolar. Even our emotional makeup comes from these genes. It's a bit like russian roulette as to what we end up with.
Nuture or lack of it also comes in.
I am super sensitive too..... and I hate it.
All we can do is our best. Please try not to beat yourself up.
Like you said........ you are working..... and that's all we can do.....