Either is acceptable. In a context like this, there isn't any difference in meaning.
The past simple puts the focus on what you just "did", while the present perfect emphasises the result in the present ( that you're standing at a bus stop feeling frustrated). What's the difference? In this case, nothing at all.
Nor do I think there's a regional difference in this case. "Just" is a grey/gray area timewise, and both AmE and BrE speakers use both tenses with it.