We are identical twins but doesn't look the same at time.And I want to look like identical twins.?

We are identical twins but somehow we doesn't look the same at time.I look wider but she look skinnier than me.I hate it when people compare me to my twins saying that I look bit fat than her.She have long hair while I have medium cut hair.It hurts me alot thinking of what people say about me.I go for diet this few days just to make sure I look like my twin because I don't want people to tease me.Can someone help me look real identical twin when I am an identical twin.