Why not, me?

Life is an ocean. Deep dark. This is my home, and I'm slowly sinking in it. Im a normal girl. This is how the the deep I was born in, slowly killed off the last bit of life in me. It started with the perfect girl. Xylia. Hair the colour of sand on a warm summer day. Skin clear, like morning dew. Somehow she always naturally smelt like vanilla. Faultless without even trying, and brilliant at that. Somehow her heart beat always had the perfect rhythm. How could I hate an angel? The only thing I knew was her fate. I've known her for as long as I can remember. Long story short, our relationship was like sisters. Our mothers were quite close, so it wasn't surprising that we grew up together. She started the race, while I couldn't even participate. She was always kind, don't get me wrong. My whole life I just lurked in her shadow. She got all the love and praise she deserved. The sad part is all I wanted was to be half what she was. Eventually jealous started to stalk my every move. Darkness started to blossom inside of me. What could I do but plot her demise?