Is your identity a string of letters? Don't be ridiculous.

Yes, if there is a set of strings that can uniquely identify you, and you can't have it removed, nor act like somebody else, it's your identity.

Even GDPR admits it

	▲	skywhopper 18 minutes ago \| parent [-]
		So, your name is also this sort of identifier. But an “identifier” is not an “identity” in the way you mean it. Sometimes words are used in multiple ways.