In my health book its said its impossible to be of O blood type if one of uour parents is AB(my mom). The other 1 is O(dad). I have an O blood type. Also there are pictures of "me" up until I was 1(with pitch black hair and ice blue eyes)n then there r no more pictures(at all n I'm serious I've looked everywhere meaning my house my grand parents house nothing n pictures of the whole family don't have "me" in them)after my 1st b-day n then when I turn 2 they suddenly reappear wit brown hair n green eyes. My "mother" says that they changed color but I compare the faces n there our 2 many differences(the eyes rnt shaped the same different nose n lips n my earlobes where connected in the ones where "I" am 1 n aren't when I'm 2) My parents when I bring up the word adoption(even if its about adoptin a pet) get all nervous. So am I adopted?

You might be... you might have also had a different parent than you are aware of... or NOT have been adopted but was conceived as a result of invitro fertilization with the aid of a sperm donor... which is not all that uncommon for couples that have trouble on their own.

Until your parents are comfortable enough to tell you if you were, you have to assume you weren't. Some kids really DON'T look like their parents, like two dark haired brown eyed parents having a blonde headed blue eyed child... it is all genetics. Some traits skip generations.

Eyes and hair do change color, esp from age 1 year to 2 or 3. I started with blond hair and more greenish eyes, to brown hair and blue eyes.

Also how exactly do your know mom is AB

This is on the American Red Cross web site on Blood typing
Note: If you have questions about paternity testing or about blood group inheritance, your primary care physician should be able to provide you with an appropriate referral. Testing difficulties can cause exceptions to the above patterns. ABO blood typing is not sufficient to prove or disprove paternity or maternity.

So there are other factors and in fact AB in some cases, So you need a better test such as DNA, since there are factors that can cause this.

Also so what if you are ? It means that they loved you enough to pick you,not just be stuck with what ever baby that they were borned with.