I'm obsessed with Hilary Duff and I cant stop idolizing everything she does.?

I am 18, Hilary has been my role model since I was 12, and it only grows more with each ping year. The thing is, I dont even know what I like anymore because mainly make myself like things she likes, like how I got the exact same cellphone and pink ipod nano as her JUST because she has them when I wanted a different cellphone/ipod. I mainly act exactly like her, I study ever interview and have every magazine with her in it, and I use quotes she says or I say things she says in my every day life so I can talk just like her. I dress like her and constantly buy things very similar to what she wears, from jewellery, to shoes, clothes, bags etc. I have all the movies where she is the main character, a million posters and over 8,000 pics of her on my personal computer from oh-hilary.com. I only hang out with a small group of close friends just like Hilary does, and we would NEVER drink/smoke/party etc, I wouldnt because she doesnt. I dress like her, act like her, like what she likes and I am constantly obsessing. I volunteer at a number of different charity events and animal shelters like she does and am interested in a career where I can help people. I ALWAYS do my hair and make-up like her, and I never tell people off because I know she wouldnt so I have to force myself to be really nice to nerdy guys I hate hitting on me just cause I know she would. Me and Hilary are both extremely shy and when I want to stand up for myself to my boss and fool around at work I dont because I know she wouldnt do that. I feel good if I know people see me as a sweet and inncoent girl just like her, and I only feel really happy about myself when I feel like I look like her or act like her. Im not sure if im missing out on fun by being exactly like her. Is this unhealthy for me or is it okay? Should I give this up and just be myself or should I keep being like her to be happy? I cant decide if I should drop it and just be me or keep living up to her...