wow i just found this randomly but i'm in a situation not very much different from yours (the only major difference is that my teacher is a guy hahah) but i'm 17 and he's 37 so yeah, big age difference. i think he has taken a slight interest in me (even thought he's married) just by the ways he acts and things he does for me but i know it would never work. i've thought of confessing, but since he's married and all, it wouldn't benefit either of us and practically no good could come out of it. if your teacher isn't married and you believe she does have feelings for you, i would encourage you to confess. but maybe you should wait until you graduate so it won't make things awkward during the school year in case she happens to reject you. good luck!! :)