Why is making friends as an adult so difficult?

25, F for context. My ex dumped me in November and I felt SO alone. It was a wake up call to create a life outside of romantic relationships so since then I’ve made it my priority to make friends in my city. But honestly it’s really getting me down. I’m putting myself out there but everyone is so flakey. I’ve joined Facebook groups designed for lonely girls who are looking to make friends. These girls even post that they are actively looking for meaningful friendships. I can’t tell you how many people I’ve messaged to plan to go for a coffee etc and it never materialises into anything. I’ve been ghosted by so many girls, it’s hurtful and is honestly worse than dating. I even made a WhatsApp group for girls in my city going through breakups. 30 people joined. Ive tried 3 times to arrange meeting up, and all 3 times they either flake last minute or ignore my message in the chat. I know people have all sorts going on in their lives and I’m really really trying not to take it personally but honestly the constant rejection, first from my ex and now from trying to make friends, it’s starting to get to me. I’m taking a break from trying to force friendships right now. But has anyone else experienced this and how did you navigate it? I like to think I’m an easygoing, fun and friendly person, I personally would want to be friends with me lol