Not trying to be rude or anything but why is your wife 17? Shouldn't she be in school? (not like I think school is important). She might be financially fit if she has a job. But if you guys have a kid, it's going to be way harder.
Yes. By marrying someone under 18, you have taken over the financial responsibilities she needs and has. You are financially responsible to support her if you separate -meaning rent, bills,utilities , food, clothing, medical, and educational. Since I'm sure you had to have parental permission to marry her, you basically also took over the parental as well as fhe spousal role when you married her.
If you took responsibility, why are you looking to get out if it? I suggest you see a counselor. If you can't afford one, find a good church with a pastor or older couple to help. You can make it through this if you are both willing.
She can move out...not sure she can get a place on her own due to the fact that she is I don't know..a friggin child?? I think you should write a note to yourself to not marry a person who is not old enough to get their own apartment. You are now stuck with her and have to support her until she is 18. I hope you are not asking this as permission to keep her prisoner. If she wants to leave, let her leave. She can move into her parents house or friends house until she is of age.