Alright, maybe some of the other people on here are sadistic, but I am not. Here is my advice.

FORGET ABOUT THIS. Looking through your post, I've noticed that for the most part, you have answered your own questions about the subject, and are looking for confirmation.

There is nothing good that could come of this. literally. Family and friends would ostracize you (unfortunately.) Your grades would immediately become suspect, you could endanger the career of the teacher, the teacher (if she's a good one) WILL reject you, hopefully nicely, possibly not - followed by even more feelings of rejection. If she's a bad teacher, she will accept your advances. In the long run, this CANNOT work out.

You're best bet is to try to move on. It will be hard, but try to realise the ways that this could affect both you and her, regardless of how she would answer. If this was someone from your group, I'd say go for it - embarassment only lasts for a little while if she doesn't like you that way.

Do yourself a favour, move on. You know this is what you need to do, you just needed someone to say it to you.