Hi confused_male,
Welcome to Susan's. You'll find lots of people here who share your problem and have gone through what you are going through. If your mother has stated before that you were supposed to be a girl than there may be a good chance she will be very supportive of you. I know it is difficult to broach such a subject and fear is a big part of that. I wouldn't be overly concerned about your brother and sister though. Just because you have siblings is no reason to deny yourself. If it is their rejection of you that you fear than that is something to consider but if you are holding back because you feel some sort of responsibility to them than I think you are holding back for the wrong reasons. Just something to consider. There is lots of info here at Susan's that can help you. Please be sure to read the site rules and then check out the Wiki there is lots of good info there as well. So fix yourself a cup of tea or other age appropriate relaxing beverage, sit down, take your shoes off and set a spell.
Good Journey,
Cassie
[edit]Kimberly: Adjusted name.[/edit]