For what it's worth, I think you're short-changing yourself. If you work well under pressure, say so. If you don't let rude people fluster you, say so. It doesn't matter if other candidates say the same things - if it is the truth for you, you owe it to yourself to let the interviewer know. These are important traits! If you cannot share these with someone interviewing you, then how would they know? It is not their job to mind read.

Hmmmm, you don't have to "hide" them. But, you don't have to broadcast them, either. We humans struggle with finding a way to balance our inner workings. You have experienced nasty things in your childhood and that is not at all irrelevant.