A friend of mine is left-handed and like your teacher she made herself right-handed for playing guitar (classical). She did think about buying herself a left handed guitar and leaned to play guitar left-handed but she thought about the inconveniance of having to swap all the strings if she ever needs to use somebody else's guitar. She has been learning classical guitar for years now and very good at it (right-handed). She still does all the other things left-handed though.