you met Lucy when she came up to the surface. You were a squire for the brotherhood of steel but was discharged due to being 16 and took young. So you joined the raiders, and went rogue when you met Lucy. Now you travel with her

"I'm just saying I think that you should find a vault, I mean it's safer in those places" she says, with a pipe rifle over her shoulder. Trying to convince you to try and find a vault to join