Mom keeps trying to get me to find girls for my brother

My brother just pretty much told me to screw off an hour ago. I'm a year older than him. I'm 22 and he's about to be 21. My mom has been trying to get me to find him a girlfriend since we were in High school together. My brother has never had a girlfriend and according to my mom he's still a Virgin which idk why my mom is keeping tabs on my brothers virginity. Every girl I've ever tried to set him up with he rejected. At first I thought he was extremely picky, but now I think he's just not interested in being in a relationship. He's a book worm and he's in college to be a teacher so honestly I think he's doing just fine without a girlfriend. My mom's whole reason for all of this is my brother is the only hope to give her a grandchild since I can't have children and that kind of hurts but I try not to let it bother me. For Valentines day my mom basically wanted me to lie to my brother about hanging out and really set him up on a date with one of my friends. So I did that. I said we were hanging out and lied about where we were going and left him with one of my girl friends. Date didn't go well. My friend told me once he realized what I had done he left and he called me today yelling at me to stay out of his personal life. Honestly he should be yelling at mom. Shes the one pushing this so hard. She should just accept her son isn't interested in a relationship or sex. I really don't know ow why she cares about the sex part, and she should just leave him be because now its effecting our relationship.