Do you ever feel like your relationship is a bad idea or regret it because their family makes you uncomfortable and you don’t want to be apart of it?

I love my SO with all my heart, he is the best thing in my life and has been wonderful to me and has helped me a lot. He’s also my best friend. However I constantly feel regret and like I want to get out of my relationship because I absolutely can’t stand his family. They make me uncomfortable and cause me anxiety. I obsess often about situations with them that have either happened or scenarios I play in my head of what could happen. It makes me question my relationship and I don’t want to feel that way. I don’t want to be involved with any of them I don’t want them in my life I just want to be with my SO