what should I do ?

What should you do, about what? Living with your boyfriend or talking about your large family?

Xiao--

You can choose a husband, but you're stuck with the family you were born in.

There are probably a million eligible men in China that you could marry and I will guarantee you that not one single one of these men comes from a "perfect" family. There are no perfect families.

Anyone who would sneer at you because of your family is someone you have no need to be involved with.