I feel so pressured! Why are they doing this?

I feel I MUST get married & have kids (some day), as I worry my mom will be hurt if I didn’t give her grandkids. Whenever I say I don’t want to get married anything soon, she says I WILL (everyone thinks I’m joking), as she tells me how she & her siblings once said the same thing. I’m scared of marriage. I find it not worth it these days, as I don’t want the hard work or sacrifices (unless I’m getting paid).