They can't invade if you're not in human form and you start the game undead. Just don't human up if you're not prepared to be invaded.
Ah...does that affect the game in any way other than what your character model looks like?
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http://img.imgcake.com/Nevest356/1dollagifas.gif - Legen- wait for it...
We had sex and...I caught feelings! - Barney DARY!