How do you define yourself? Don't you have a people, a group or tribe (whatever you want to call it) you belong to? I know people who define themselves as "human" and "citizen of the world", but they are quite uncommon.
Is a legal construct, which can be granted to a natural person by law.
Legislation can be (relatively) easily changed. I don't think there's anything preventing legislators from granting citizenship to $PERSON for $REASON.
So I'd argue that it is something that can be given - it's just that there's reasons that it's not.
It says nothing about requiring blood spilt.