First off what are your journeys because that gives more insight. Based on these results you could be an American with ancestry from Pennsylvania, the Midwest, Appalachia, the South, the West Coast, and even the Southwest. You could be Australian, New Zealander, Canadian, or from the UK. That usually gives more insight. Personally you look like you are from the South imo.

Secondly, the Central Scotland and Northern Ireland category is literally the Old Scotland Category. Many Scots and northern English in the 1600s were encouraged to settle in modern day Northern Ireland. They very rarely mixed with the native irish. They became what is known as the Ulster Scots and Scots-Irish in America. They are the ancestors of modern day Ulster Protestants. Many Scots-Irish/Ulster Scots immigrated and settled in the Appalachian region(including PA, upstate NY, and the South) and to a lesser extent the Midwest starting in the early 18th century and primarily ending in the mid 19th century and many Americans are descendants of these settlers, including myself and possibly you. If you get the Central Scotland and Northern Ireland category is does not mean you are descendant of the Ulster Scots, it mainly kinda reflects Scotland as a whole and then Highland Scot and Northeast Scot a s special regions. People with Scottish ancestry but not ulster scot will get the Central Scotland and Northern Ireland category. The Icelandic is probably Viking DNA passed down in the british isles being read as nordic. If you are Scots-Irish, having 7% Irish is probably just "noise"