I might be jealous of my kids
You are envious and that is a difference. You have such beautiful kids, no wonder you are that way. Can you just make yourself happy with them instead?
I was so cold as a child, but they are so warm to each other
Feel proud and forget the envious stuff. You shouldn't have wanted the opposite in them would you? Be praising and make them feel encouraged for a better life for all.
I know, but it's hard to stop feeling like this.
You have come a long way raising these kids and so now you have to be proud of that.