How Can I Convince My Mom To Let Me Not Go To A Party?

Anonymous
So I have this friend that I'm not really close to. Actually we only see each other like 3 times a year or something. It's cuz our moms are actually friends so we kinda had to become friends. I'm not saying it's a forced friendship though, like she's pretty chill.

Anyways so her birthday is in like a few days and she's gonna have a birthday party. And a lot of her close friends from school or whatever are gonna be there, meaning that I literally won't fit in cuz I won't know anyone who's there other than her, and she'll be with her closer friends. So overall, I don't want to go to it. My sister was also invited but she said she wouldn't be able to go cuz she has work that day. So I talked to my mom and she kind of understood that I'll feel awkward there and so she decided that I could not go. Cuz I really don't want to go. I'm like a huge introvert and I'm not good at talking with people. I know that some of you might say that this party could be a good opportunity for me to talk to more people, but please understand that I really can't do this.

Anyways so I thought that everything was good and that I wouldn't have to go, but they changed the date of the party to a day my sister isn't working, so my mom is now saying again that we both have to go, and I know that my sister doesn't want to go either. We once went to her party a couple of years ago and it was the worst thing ever. We were just there in the corner cuz we didn't know anybody there. We hated it. So, how can I convince my mom to let me and my sister not go to the party cuz there will be like nobody we know there and it's gonna be so awkward.
How Can I Convince My Mom To Let Me Not Go To A Party?
How Can I Convince My Mom To Let Me Not Go To A Party?
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