So, you suspect you might be an incarnated angel, but you have no idea who… Here’s the easy, scientific way.
Print all the angelic seals (seal of michael, seal of gabriel, seal of metatron, etc). Cut them out. No consecration or special procedures are necessary.
Get a voltmeter and hold one lead in each hand between your thumb and forefinger. Do not vary the amount of pressure on the leads. Let yourself relax.
Have a friend place the seals, once by one, against the back of your neck, and record the millivolt change on the voltmeter as they do so.
In my Reiki Master class, we did this (I would show up with random gadgets and sigils at class every week, obviously). See how it works for you.