I Wish I Had More Close Friends

I’ll start by saying I love my friends and I’m happy they’re happy, but I want to know how would you guys dodge the topic of relationships? They’re all happily coupled and I’m so single it’s pathetic. They mean really well but whenever I see them they tend to always ask how my dating life is going and I always have the same boring answer. Since I’m the only one though it’s finally gotten embarrassing. I don’t want them to feel like I’m annoyed or mad at them for asking, or that I resent that they’re all so happy, I’ve just gotten to a point where it stings to talk about it or hear them talk about it. How would you go about it, or how would you feel if you were the friends in this?
Also side question: my best friend asks me for relationship advice... probably because we’re so close. Because it makes zero sense why she wants my opinion on anything like that. How do I get out of that too without seeming like I don’t support her?