I'm a bit bitter that my sister "stole" my baby name
You did not want her to use that name then?
I would have preferred a different name.
Don't feel too bad about it. You can always use that name once you have a baby.
Maybe, I should totally go live my own life to stay away from my sister.
You still have time to find a new name. I know that it is upsetting when someone takes that from you, I can see why you would be hurt.