Truthfully, I don't see why you'd be significantly more traumatized by this event than any other act of terrorism that happens across the globe unless you lost loved ones. To that end, I don't see why anyone else on this globe should have been any less affected, thus making the point that you happened to be an American at the same time that 9/11 occurred more or less moot.
If the pain is simply an empathy to the innocents who were harmed, I don't see why it should be unique to you as an American and worthy of pointing out and using as leverage. I'm not in a position to tell you or anyone else how they should feel...I just don't really understand the rationale.