[jyhugikuhih]

Bro, the dream was probably just your subconscious at work. You yourself said you liked this girl and were thinking about her a lot. The fact that you "prayed a lot" that night is neither here nor there. You are either infatuated or in love; either way, you will "see" what your heart wants you to see. Every little thing will become a sign that you're "meant to be together". Don't believe it.

You should not be thinking of ghayr mahram girls during ramadan in the first place. If you can't get married now, then that's that. There's nothing left to do but forget about this girl. It might be hard, but it must be done. I don't know how long it will be till you can get married, but if she and her parents are willing, maybe she could "reserve" herself for you until you're old enough. But even then, you cannot think about her or see her.

I've seen this too many times, man. Guy falls in love with a girl and spends every waking minute thinking about her. Dreams about her. Spends his money and his effort in trying to impress her. And in doing so, neglects his deen and dunya, starts doing poorly in school or at work, starts missing prayers. In the end they don't even get married, and the guy has ruined his prospects in life.

Don't let it happen to you. Focus on your studies or your career, and your deen. Get some good qualifications. Inshallah then you'll find it easy to get married to a nice girl.