I hate my step sister

helpmealitttle
Please excuse me for saying, but I really hate my younger step sister. She has always had it easier than me and her mum was a total bitch to me when I was younger. Now my step sister is engaged and even skinnier than before (always looked better than me) and I'm in a new relationship with a guy that says he doesn't want to get married for at least another 10 years, which will make me 37,and trying really hard to lose the weight I've gained recently.

I have struggled with everything in life and nothing came easy, but my step sister is so popular and attractive and got the dream romantic proposal and I'm getting really depressed. She even decided to change her last name to the same as mine and my dad's. I don't know why she did cos she still has contact with her own dad. It hurt me deeply when she told me.Her life is continuing to get better and mine is still a struggle. I deserve to have an easier life. I'm a lot nicer than her and respect others, but she doesn't. I can't sleep at night because I'm thinking about her and how much better she's got it. What should I do to get it out of my head?
I hate my step sister
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