It’s not. I don’t have a middle name and it’s never been a hassle. You either leave it blank, put a dash or write “NMI” for “no middle initial”. You will see the latter on some US government forms.
Wow, I didn't know I was american just because I have a middle name.
My brother in Jesus Christos Santa Maria de la Mancha, that’s not true.
Err, I thought his middle name was Fucking. JFC. Isn't it?