Xin, You are correct, you cannot put the bone down!!
Don't concentrate too much on ethnicity results, they appear unreliable. However, I will try to explain them as much as I can.
Your ethnicity shows 70% Western European, 26% Scottish and Irish, 0lus small amounts of others, as you can see.
This is not within your paper trail limits, but supposedly refers to your roots from thousands of years ago. Whether you take any notice of this is up to you, I personally haven't taken much notice of mine. They are not generally considered to be reliable, though ancestry peddle their tests as being accurate for ethnicity - who can prove them wrong?
Your clip shows ancestors from your tree, concentrated in SE England, a few from SW England. The dotted lines could indicate emigration, or perhaps a mistake on Ancestry's part in interpreting your locations!
Hope this helps a bit. The best advice is, as diplodicus says, slow down. Experiment a bit, make a few contacts, make a few notes.
And don't panic!!
Regards Margaret