Is it weird to feel uncomfortable around your sibling?

PinkT15
Ok so, I have 3 older siblings but I'm only uncomfortable around one. It's my sister, she's 28 and I don't know I feel like because of our age difference (11 years) we never had a "typical sister relationship" I guess so that might be the reason. I feel like she acts more like a mother than a sister, minus the nurturing and caring components. She's kinda overprotective sometimes and definitely bossy. I hate being left alone with her because it always feels really awkward to me and if she says a joke or something for example I feel like I need to laugh even when it's not funny like out of necessity, or if she try's spending time with me or something... ugh I'm automatically ready to leave because I feel like she's a distant relative. It's only with her not my brothers and I don't know what the problem is. It could be our age difference but my oldest brother is older than her and we're still pretty close. So, is this weird and any tips? Thanks.
Is it weird to feel uncomfortable around your sibling?
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