What can I do to avoid feeling like an outsider in my boyfriend's family?

My boyfriend (23M) and I (24F) have been together for just over a year. Since we both live at home, I’ve had the opportunity to meet his parents and siblings multiple times. However, I’ve always struggled with social anxiety, which makes it hard for me to open up and truly be myself around others. His family dynamic is quite different from mine, and I’ve found it uncomfortable to fit in. They are really close, spend a lot of time together, and generally come across as a “normal” family, while my own family is more distant and has faced its share of conflicts. I’ve been making an effort to engage and be myself in order to feel like I belong, but I continue to find it challenging. The main reason I wanted to share this is because of something my boyfriend's dad said last night. After dinner, there was a typical debate among his siblings and my boyfriend about who would help with cleanup. One of his brothers questioned why my boyfriend wasn’t pitching in, and my boyfriend responded, “I have a guest.” His dad chimed in, noting that it's a general rule that someone with a guest is not obligated to help. Then the brother pressed further, asking why he had to help clean when his girlfriend was over. Their dad indicated that was different, explaining, “Because [brother’s girlfriend] is like family.” I kind of zoned out after that, but a moment later, the dad added, “Well, I suppose that applies to [my name] too.” I recognize that there was no ill intent behind his comment, but it stung nonetheless. It makes me feel even more like an outsider, and I'm unsure how to navigate this. My boyfriend encourages me to relax and be myself, but sometimes engaging feels like telling a joke that falls flat, with crickets in response. He’s also advised me not to compare myself to his brother’s girlfriend, which I’m trying to avoid. To be fair, I know his family doesn’t dislike me; they’re very kind overall. But the dad and siblings seem indifferent, at least from my perspective. Maybe I’m overreacting or just having a tough mental health week, but I want to know how I can improve the situation. I’m trying to express myself at my own pace, but I wonder if there are additional steps I can take to feel more included. Has anyone else experienced something similar with their partner’s family and figured out a way to navigate those feelings? I’d appreciate any advice on how to make this situation feel more welcoming and inclusive.