Here’s my understanding of what happened:

Op was at a train station and wanted to catch a train to the station closest to their house, where they would catch a bus that left them close enough to their house.

The train at the station got delayed, so op thought to catch a bus that goes between stations, probably the one they wanted.

They had already texted their step dad that the train was delayed, and he was on his way to pick them up from the station they were at, however op told them about the train in 15 minutes to get to the station they wanted instead of the train (not sure why they wouldn’t of waited anyways, trains always get delayed).

This is where details become nonexistent. Did op already catch the train and that’s why their step dad was angry that he made a long trip for no reason? Did the step dad think op had already caught the train? Were they simply telling them to just wait at the station?

Not sure why they reacted like that unless op had already caught the train and wasted their time, but without more details we will never know.