We learn that she is a scavenger that is just getting by, barely, on a harsh planet as she waits for her family. She plays with her googles, indicating a desire to travel into space, which is later supported by how she knows so much about ship mechanisms, which she obviously studied in the meantime she was on here. I'm guessing that the dealer alien wasn't the first one who tried to steal her product before, so we can infer that she learned to fight from first hand experience. And really, that's the only relationship we see she has, a business one with some scumbag until BB8 comes along, which is something she seems to have deliberately chosen given her insistence for BB8 to GTFO of her life as soon as it's possible.
Like Luke, she is torn between her desire to go out into the world and wanting to stay for her family. The real difference is that while Luke stays because of living relations that hold him down with responsibility and love that have to die in order for him to actually move on, Rey's call of adventure doesn't have to destroy her home, because she has no attachment to the home she has. Her finally moving on isn't any kind of tragedy, it's a relief because she finally has an excuse to go out to explore. She wants to go back because of the family bit, but as it remarked afterwards, there really isn't anything there to go back to. So there is a difference regarding the levels of sentimentality, but you can't say we don't learn about Ray's life there. We do. It's just kinda shit so there's no emotional attachment to it, while Luke basically had it good until it burned down.