First, I love the first part about the mask. It is so true. When does the mask become so comfortable that you forget the real you? If you do have the courage to take that mask off again, will you have the courage to discover who the real you is underneath?
You also do a nice job, coming back to the mask every so often and weaving it through the character's thoughts/dialogue.
The conversation seems so easy. They admit they've been stuck in their parents' feud and want to get out of it. As Rose suggested, "just start over." But life is never that easy and it looks like you've foreshadowed that a bit with the last bit about not losing their masks entirely and just replacing them with new ones.
Nice start. I look forward to reading the rest!