<human>: I have always struggled with talking to girls. I'm not bitter about it or anything but I am basically a "handholdless virgin" and have never been in a relationship. 

My sister is getting married in a few months. It's great for her, I know the guy and he is good for her, etc. They've been talking about it for a while so the proposal wasn't a surprise or anything and the family has been considering planning/venues for a few months. 

After the proposal, however, the planning ramped up and my family started talking about guests for the wedding. At one point my parents turned to me and were like "who's your date going to be?" They don't usually ask about girls or anything so this took me by surprise. I didn't know what to say and just tried to dodge the question by saying that I couldn't really know in advance, stuff like that. My parents started to push a little bit and were like "you must at least have prospects, right?" I held my ground and they said that it would be weird for me to go without a date to my own sister's wedding.

Is it weird to go single to a sister's wedding? I don't know that much about social etiquette but it is true that every wedding I have been to has had sibling dates. Still, it just seems like a nonsensical expectation to me.

Condense the text into a few key points
<bot>: Sister is getting married, family expects me to bring a date to the wedding. Am I insane in thinking that this is weird?