This is the bit that matters. You don't need confirmation from anyone (although it's often nice ). I think the difficulty might be that you are perhaps thinking in terms of human "hierarchies" and therefore wonder "who are YOU to be an incarnated angel?". It's a kind of inverted humility. You don't want to feel as though you are setting yourself above everyone else, or claiming yourself to be special, or blowing your own trumpet.

But everyone on earth is special and here for a reason! That yours might well be (and most likely is, according to your own inner-call) that you are an incarnated angel is perfectly normal. The earth is currently covered in angels and all manner of ethereal beings here to help.

I'd say accept it, be it, try to find out what you're "meant" to be doing because of it. Listen to that knowledge you have about yourself.