I want to change before school starts. I shop to much. Please Help.?

I am kind of shy. I never answer questions in cl even if i know them. And whenever I do get picked on for answering a question i get it wrong, but when i know it i never step up and say it. I hang out with certain people, but i seem to get along with everyone. I like to wear American Eagle clothes. Coach Shoes and Ugg boots.I have like 11 Vera Bradley bags and 4 Coach Bags. For some reason i always have to have what other people have like if someone has Coach shoes i have to get a better style. Or if someone has Ugg boots i have to get Uggs, but i had to get 2 pairs of the clic short and 1 pair of the Clic Knit. For some reason i can't even step into Old Navy, Khols, Aeropostale and even seem interested in the clothes, i have to go to American Eagle, Hollister, Abercrombie, And Victoria Secret Pink. I used to be fine with going to cheaper stores and getting shoes from the foot locker or journeys. I have to go to Macy's and Lord and Taylor. I know i seem pathetic writing this but i want to change. When I graduate High School I want to move out and live on my own but how can i do this when i have to have the best. My parents buy most things for me. I only bought 1 pair of Uggs. I need some answers on how i can change my ways. Just saying stop is not going to work. Thanks for the help.