I dyed my hair light brown from bleach blonde and now I want my blonde back!?

Look you.. Freeze that dying hand. You are damaging your hair. Blonde dyes are bleaches, even at their most gentle. Repeated bleaching damages hair follicles, makes them thinner and less capable of holding dye. So when you do dye, it will fade more quickly. You need to be patient now, and in a few months begin highlighting it back again like your hairdresser suggested. If you are going to dye it anyway because you just can not stand the color (or your mother ideas), pick something darker and very gentle so as to not damage the hair any further. Seems like you're never going to be satisfied with it, so why not go really out there with a deep auburn or wine for the summer. Maybe a funky new cut to add along with it? No more bleaching until Thanksgiving! Set a goal...