How do I convince my Mom to let me do age appropriate activities?

I am 15 years old. My Mom wants me to act like a toddler. She took me to Disney World and made me take pictures with the characters like Micky Mouse and Goofy, and made me ride the merry-go-round. She won't let me watch the Twilight Series, saying that I am not old enough for that. She doesn't let me order for myself in a restaurant. She tried to get me to sit on her lap. She won't let me listen to rap music or anything that I like. How do I get my Mom to stop treating me like this? I am tired of having to act like a baby all the time.