girl to girl: way to go, girl! i admire you tremendously for your efforts. i was born frum (religious) and unfortunately have had some rough turns before i finally came to realize the right path!! Thank G-d.
i would recommend Gila Manolsohn’s books on tzniyut/modesty and jewish relationships because she was in the same situation as you and makes things very clear in terms of dress for women. but start reading these books even before you start dressing differently, so you see the logical reasoning behind it, and it will be SO much easier for you!
good luck and a huge MAZAL TOV