Yeah good luck. You her only child? She gonna nag you to death until you give in. I was my mothers only child, but I have 9 other half siblings. She nagged me as soon as I turned 21, then I told her I wanted to go to graduate school like you want to right now. She ended up paying for it. Then, a couple years later after traveling the world and working, she started nagging me for marriage and kids. That was when I was 26, It never stops if you're their only child, especially for mothers.
My mother had me pretty late, she was married to my father for about 10 years before she had me. And actually, she doesn't give my husband a hard time cause she thinks he's the ultimate good guy. She takes his side on everything.