Is this legal? Is this fair?

Hi. Im 13. My parents died in a car wreck when I was 10 and I have been raised by several aunts and uncles since then. This year, I was formally adopted by my Aunt Victoria (and her husband), who I love dearly, and who I actually chose to be the ones to take me in. She (and her husband) is a loving, caring, approachable woman who always encourages me, and loves me like her own. I think of her like a second mother. I also, in fairness, chose them because they are consistent with expectations with their own kids, and I know that IҒve developed a lot of bad habits the past few years as everyone (feeling sorry for me) has basically let me get away with whatever I want. I know that isnt a good thing. The trouble is this. The paperwork was finalized this week, and they sat me down last night and told me things were about to change, that I would have to follow the exact same rules as their other kids. This is obviously fair, although more difficult than I imagined now that I realize just HOW much slack I had been getting. But I understand that it is fair. What seems less fair is that she says IҒll have to accept the same consequences as well, loss of privileges, grounding, and (as a last resort) spanking. I was shocked. I havent been spanked since I was like 5. It just doesnҒt seem fair. Is it even legal at my age? I tried to reason with her, but she wouldnt budge. She says IҒve developed a LOT of bad habits and I need to know that they are there to love and encourage me, but also to correct me when Im wrong. She said that since even I admit that I fear spanking more than anything else (low pain tolerance) it must still be effective, and meanwhile sheҒll only use it as a last resort so if I shape upӔ I shouldnt have to worry about it. But I AM worried about it. It just seems so so unfair. But she wonҒt budge. She says she cant let me grow up the way IҒm going right now, and if I want to live in HER house and be HER daughter, then I need to let her raise me as SHE sees best. Otherwise, shell always love me and be there for me, but part of choosing to be adopted here, is choosing to BE the daughter and let her be the mom. I agree with all of that in principle, but spanking? I know I must sound like a total wimp, but I just really donҒt want that. Is this legal? Is this fair? Perspective..