Yes, it's nothing unacceptable anymore. Many may still prefer the traditional way of him proposing to her, but the other way round is just as fine nowadays.
The guy ask the girl out on a date trust me a girl will most likely never ask guy out. Even if you asked her out on a date might pay the bill but other times your most likely goin to have to do that...
You don't. You are way too young to deal with such an older guy. At your age you should hang out with someone your own age. 17 year olds can play too many head games with you at such a young age....