It should probably be in theaters for at least the 2 weeks before it gets posted at the normal date so maybe try to find a time during then?
As for the parents/money thing, maybe just tell them it's something you enjoy and ask them to take you to watch it/borrow a little bit of cash for it? You could also ask if they have extra things you can do for some money.
Ik it might seem a bit embarrassing but if you really want to see it early you might just have to bite the bullet and do one of those things