This is not love, but hormones. In some ways, we can't help who we find sexually attractive. However, that doesn't mean we have to express or act on those feelings.
People sometimes develop attractions towards inappropriate and unrealistic targets. Examples include a crush on a teacher, boss, doctor, parent of a friend, a married co-worker, etc. Young people, in particular, may experience romantic feelings for authority figures in their lives such as teachers or coaches. Although normal, it can be a very confusing experience. This is what has happened to you. The relationship cannot ever ethically take place for a variety of reasons (e.g., teacher/student boundary, there is likely a substantial age difference between you, she is married). While the "forbidden" nature of the attraction may make it even more appealing, please realize this is a crush -- pure fantasy -- and that's where it should remain. Let me emphasize that you're not bad for feeling this way.
I recommend setting your sights instead on a classmate or other young woman who is not ethically "out of bounds." You might even consider what qualities your teacher has that you find particularly pleasing (e.g., sense of humor, red hair) then use this clarity to help you find an appropriate mate.