How do I stop being disappointed by my friends without kids?

Sorry if this has been covered elsewhere or if it’s not the right place for this. I also don’t mean to shame anyone because I know how busy we all are, but I just need some advice. I can’t help but being constantly disappointed by “friends” who consistently don’t show up or make time to hang out when I can. I am still the only one in my friend group who has kids and have fought for years to somewhat maintain a social life, but lately it’s really weighing on me and I’m scared that soon I’ll have no real friendships anymore. I’m also scared to start over, because as I get older it seems even harder to make new friends. It’s really hard to maintain relationships as a working mom as it is, but I feel like it’s even harder with friends who don’t have kids and understand the time constraints/general limitations that come along with them. How do you guys maintain friendships outside of work? Is it even possible to have good friends between work and parenthood?