mixed
I learned english by watching American TV in the 80s... cable TV with subtitles. Vocabulary came from reading LOTS of novels, specially early Stephen King.
When I started working (for BP) I went to work with a shitload of Brits and scottish. Later on lived 2 years in Trinidad.
If anything, the most recurrent comment I have received concerning my accent is that it's hard to place and it sounds Texan.
In Europe I'm constantly mistaken for an American (since the English here is very British as a general rule).
Because of my last name, people think I'm Portuguese, but they never ever figure out I'm from South America, which makes sense since we are simply a mixture of different races and there's no Native-south American fenotype you can look at
nutshell = yes, I do have an accent, not a
one