I really want new friends, but whenever someone reaches out to me, I freeze up and panic

I don’t have many friends at the moment. I always like the idea of people reaching out to me and having new friends, but when it actually happens, I get nervous and freeze up. The other day, I was talking in a Discord server and there was someone there who I thought was cool and wouldn’t mind being friends with. We didn’t talk very much, but one day she sent me a DM asking if I’d like to be friends. It was basically exactly what I wanted to happen! But when we started talking, I got really nervous that my responses weren’t interesting enough. I felt like I was racking my brain trying to come up with cool and interesting things to talk about, and I just couldn’t. I kind of panicked and ended up not responding and going cold, not because I didn’t want to be friends with her, but because I just couldn’t think of anything to say really.

Any advice?