well you see, it's like this.
Tartan, kilts, bagpipes, caber tossing are all a highlander thing.
Speaking Gaelic is a highland and western island thing.
Haggis may originally be a Norse thing.
Burns poetry is a lowland thing.
the Doric is a north-east thing.
The highlanders play shinty instead of football, so shouting at the television when the footballs on isn't a thing common to all the people of Scotland.
There are a number of Scottish identities, but there isn't A Scottish identity. There isn't anything, other than being born within somewhat arbitrary geographical boundaries, that all the people of Scotland have in common.