If you have one, put the heading bug on the runway heading , or line up the CDI bar on the runway. Then if its not at the top its not the right runway.
As for making mistakes, god I fly everyday for an airline, and everyday a mistake is made. The important thing is to learn by them. A clever pilot learns by his own mistakes whereas a wise pilot learns from others mistakes. Your helping everyone learn from yours so dont worry you wont do it again, you will make others , just learn by them.
I once had to point out to the captain that he was on finals to the wrong runway! No names no packdrill!!