Why won't my Mum stop pressuring me into getting a Girlfriend?

Mom's job is to make sure her children are happy. Evidently, she doesn't think you'll be happy without a girl. Mom's are like that. Just be yourself, don't worry about it. To be honest, you're sisters sound like the ones that need some help. Just because they are so shallow they can't feel secure without a boyfriend doesn't mean they have to take out they're insecurities on you. Just point the middle finger at the world right now, and start saving for when you move out of the house :).