Get a grip! Billy Connolly of course.

'Scottish' is a real can of worms.
Race? No Anglo-Saxon, Pict, Irish, or other migrant allowed? That's half of them out.
Or mixed bloods? I went to school with a Glaswegian of half Negro descent. Is he less Scottish than, say, Ewan McColl? Or more?
Upbringing? That makes most sense to me.
Personal inclination? The world is full of wannabees.

By some (oriental) standards, I am a Scotsman, since I was conceived near Loch Lomond, but I'm not petitioning for consideration. Heh heh.