Would This Be Considered YA?

To me, it sounds like older YA, because it's dealing with the whole college thing. However, I think it would work for contemporary. The versatality is actually a good thing. You can market it to either YA or adult first, and if you don't get any acceptances, you can market it toward the other.

I've seen quite a bit of college fiction in the YA section, so I'd be inclined to say that yes, it is YA. But it is also your story. Perhaps it depends more on how it's told than what is told.

I'm sixteen, and it sounds like a book I would take home from the library (or buy, depending). However, it does sound like it's on that iffy line where it could be either ... I think if you end up marketing it as an adult book (I may be wrong here, so forgive me), many older teenagers are already browsing the adult stacks.

The book Prep takes place at a boarding school, and at my library it is listed as adult fiction. However, I enjoyed it, and it seems like the sort of book that other teenagers would enjoy, too. I think teenagers are more likely to pick up an adult book than the other way around. (Forgive me, oh wise and reverent adults of the Absolute Write community, if I have erred in this statement. )

It is probably that magical category 'crossover'. Write it and then let an agent decide

LM Montgomery married her characters off - and Anne of Green Gables had something like ten children! She's still seen as a children's/YA author.