Hello!! Thank you for supporting us!! <3
I don't believe that can be counted as a mistake in the dialogue. Telling someone to "get lost" would be a way of rudely telling them to go away, it's true. But in this context, the MC is saying that they were on the way to class and didn't lose the way there. It would be like if someone asked you, "Did you get lost?" and you could respond, "No, I didn't get lost." and none of that exchange would be considered an insult. (Unless, of course, the other person is slighting your navigation skills--!!)
Thank you so much for playing!! Maybe soon you can have a real conversation with Dad... c: