29 and just realized I treated my 20s like a 9-to-5 job. Where do I file for a refund on fun?

TL;DR: 29M, single, no kids. Spent most of my 20s focused on work, school, and a now-abandoned business, neglecting friendships, dating, risks, and new experiences. Realized too late I lacked balance and now have no close friendships, feel ashamed, and struggle with dark thoughts. Recently started reaching out to people, joining meetups, and going out solo to bars and events to meet new people. Hoping to turn things around, but still wondering if it’s too late to make up for what I missed.

Full Post:

I (29 M, single, no kids) have been living under a rock for most of my 20s. Was super focused on work over play and trying to move up in my career, go back to school after dropping out, and building a business that I just quit on a few months ago. Yea I was apart of a group that used to hangout often, but we drifted apart. After quitting I came to realize that I avoided certain parts of my life that I shouldn't have and think it's too late.

I approached it all wrong with no mindset of balancing out my time towards the things I wanted to do versus the things I needed to do. -Keeping in touch with friends and building a strong social circle -Dating more -Taking bigger risks -Exposing myself to other things

Right now I have no deep friendships, just a few people I speak to every now and then. On weekends I want to go out to clubs or bars, but don't have any one to go with. I feel ashamed for everything I missed out on. Honestly, more and more the last few weeks I've had some pretty dark thoughts.

Over the past few months, l've made some changes. Started reaching out to people more, regardless of whether or not they actually want to hang out with me and see what happens. I joined some meet up groups and started going out alone to bars and clubs or events. Whenever I'm out I make an effort to try to meet new people and find ways to brighten up their day if I can't brighten up mine. I still feel really dark, but I'm hopeful things will change. I know a lot of things I couldn't do in my 20s I can still do in my 30s, but sometimes I wonder if it's too late to rectify a lot of that.