Hey Cat, you know perfectionism comes from parenting. You, and your sister, must be getting messages from your parents that you must be very good at everything and if you are perfect they will finally love you the way that you need them to.

Healthy children are raised when their parents want them to do well but they love them whether they do well or not anyway. There isn't any bartering love for performance.

Or maybe you and your sister are learning this behavior from one of your parents? Is one of your parents really hard on themselves about performance?

Another scenario that comes to mind is a dysfunctional family which doesn't communicate well but is high performing.

Anyway, you aren't the parent of your sister so you didn't form her behaviors. Both of you share the same environment that your parents provide since they are the ones in charge and they are the ones who set the environment.

Please continue to keep us posted on how you are doing?