She is only 17
Living on her own in an old factory, holding two jobs. One as a welder in a foundry, the other working strip clubs/bars. Then the dance school won't even look at her until she turns 18!
Of all that wrong things going on in Flashdance, her under age-ness just compounds things.
And to preempt any so-called smarty pants, no it was absolutely not normal for a 17 girl to be out living on her own like this in 1983. I'm pretty sure it was illegal to be stripping in a bar at that age as well, just like today.