Feeling Stranded

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My name is Ashley I am a 29 year old stay at home mom of one. My daughter is 6 now, and in school. We live with my boyfriend and my mother. My boyfriend is diabetic, and rarely watches what he eats. My mother seems to not care about her weight, and expects the medication to do the work for her. Neither of them are very supportive of me changing my diet, or setting new routines in place. I clean the house while my daughter is gone, and eat very little. I am trying to set a good example to my daughter, and hoping it will rub off on my boyfriend. Am I wrong to feel this way?