I was in a similar situation a few years ago and when people asked me what school I was in I just told them the name of one of the many schools I had applied to. Not because I was actually enrolled but because people wanted an answer and I figured that giving one of the names of the local schools would satisfy them. Most people don’t actually care which school you are going to. They ask just to be polite and figure it is an easy way to start a conversation. If you give a name such as ‘Bais Yaakov of so and so’the average aunt, neighbor or family friend will smile, say ‘oh how nice’ and move on.
I knew someone who came to high school in NY from either Arizona or Tennesse or something like that and had gone to public school. When people asked her which elementary school she went to she felt uncomfortable saying she had gone to public school so she made up a name that sounded legit and that was what she told everyone. The only people who knew she had gone to public school were the principals and few of the teachers and some of her close friends.
So if you feel uncomfortable telling people you’re not in school you can either embrace it (it’s hard finding a school with the right fit but eventually you’ll get there)or if it seems easier you can make up a believable name and when you do get into school and start telling people you can tell all the people from the wedding you switched schools last minute. These are not perfect solutions but they might help for the one night of your brother’s wedding and perhaps during sheva brachos too.
Hatzlacha!