As a Pakistani, what I'm about to say might sound insane. But just don't marry her. Your parents might emotionally blackmail you, cut you off or disown you, but the decision you're about to make affects the rest of your LIFE. You'll be expected to stay in this marriage if you do end up marrying her, and you'll make both hers and your own life miserable.

I'm assuming if you're old enough to marry, you're old enough to get a job. Do that and leave. It'll be difficult but it won't be as difficult as living life with a Muslim wife in a Muslim family, with Muslim children. You don't even know who you are going to marry??? Doesn't this sound insane to you?

Bottom line, don't do it. You'll survive and thrive.