Personally I would not leave my daughter at your age 17 wasn't it? alone, mainly because of the safety issue , a girl alone and at nights, not a good idea.
And I would make sure there was a fridge and cupboard full of food, and knowing me their would be some yummie extras.

I would make sure I went somewhere where I could be contacted by cellphone, its seems your folk's have kinda just walked away from their responsibilites somewhat!

Maybe they are trying to teach you some responsibilites about life, just a thought, however I don't think this is the case is it?

Just think when they return you may appreciate them more, well at least for 5 minutes lol!