Mother ruining birthday...again?

So LAst year for my birthday, my family did Absolutely nothing. two weeks after my birthday we were at a restraint and my mother has ordered my food for me (as in not letting me chose what i eat) . Half way through the meal, my mother announces this is my birthday dinner. I have no friends with me or anything. I think she bought me a clearance sports bra that was like three dollars. It didn't even fit. And she told me it would help hide my fat rolls. Thanks. My doctor tells me i am underweight. My mother tells me i should go on a diet to try to loose some of that extra jiggles. So my birthday is next week. I got a card in the mail today from my half sisters grandparents. i love how they remember my birthday and my own family doesn't. So i told my mom i don't want to do anything for my birthday. I would love to do something but i don't want to do it with her. I want it to be my decisions and not her telling me exactly what to do and when to do it. I mean come on it is my birthday. I know my mother and i know that for her not to completely control everything is impossible. SO i don't want it at all. So she says, oh your dad is doing business in houston( i live in louisiana) and i will bring you with us when we go. Now i found it is my dads business friend and my mother and my father and would be me all sharing one motel room. Mom says she will take me to the holocaust museum while we are there. I have already been to the holocaust museum several times. I don't want to do that again for my birthday. I want something happy. I don't want to go to houston with my dad, business friend, and mother a few days after my birthday and be shut up in a hotel with them. my dad made me go on one of those trips last weekend and they left me in the motel room for like 18 hours. i don't want to go. i told her that and she says oh you have to go. how do i explainthat this is my bloody birthday and i will not be bullied into doing what she tells me to do?