Joined just to post this as there is no one I can say this stuff to. My stepdaughter lives with me and my husband (her father) full time and has for many years. I feel I have done so much for her.
Yet her stepfather is "dad" despite the hurt this causes my husband. And I am "step mum" even though I am raising her. Might as well take my heart and smash it against the floor. Just goes to show stepfathers get so much more recognition even if they do so much less.
I can't say how I feel because stepmother's feelings don't matter. I am just raising her day to day - apparently that matters very little. Also I can't tell her because despite how I feel I don't want to burden her with it - she has a hard enough time appeasing everyone else. So as her stepmum with the "mother" role in her life I am making the decision to put her needs first because isn't that what "mothers" do?