I hate the way I dress any advice where I should shop and/or give me helpful suggestions?(:?

I am a 17 year old girl, who hates the way she dresses. I mostly wear jeans, sneakers and a shirt. I go to the mall and movies a lot with my friends so I am not looking for club outfits. Any suggestions, should I look at teen vogue magazines to get better fashion tips? Need a lot of help..thanks in advance(: