I’m the black sheep and family makes me feel invisible?

I’m the black sheep in a family of 6. We’re 4 girls and I happen to be the prettiest, more confident and the only one with a boyfriend. Mother is narcissistic too and they covertly try to put me down and then text each other under the table and then laugh and make it clear that it’s about me etc. There are many instances like that, where they make me feel left out etc. Every time that I distance myself and feel good they beg until they’re back in my life and it goes on and on etc. Now I’m ready to NEVER let them back in my life. Do you think it’s justified and I’m absolutely making the right decision now?
I’m the black sheep and family makes me feel invisible?
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