Never be ashamed of who you are. All the things you listed about your sister are external. I didn't read anything about her inner success.
Given the choice I'd rather invite you over to my house for dinner than your sister. You seem far more interesting.
My sister is exactly like yours and internally she is miserable. She has never dealt with her pain, she tries to just avoid it buy doing things, buying things to make her feel better and accepted.
I have a ratty old house and I buy my bras from Target. She has 3 homes (one in the states and two in France). But I wouldn't trade my life for anything because while she was busy buying stuff and perfecting her houses, I was making connections and working on perfecting myself.
Have the courage to be imperfect.