I think a lot of what newly self-employed people miss about office life can be replaced by being a regular at a co-working space tbh. I understand it's hard to make friends in adulthood, but, if you can close a sales deal / consulting gig, you can make friends pretty easily. Business relationships and personal relationships are both still relationships.
As someone who has been self-employed for nearly 2 years, I cannot relate to any of this. I love knowing and having control over all the administrative, HR, recruiting, legal, finance, or taxes tasks. I love knowing I can take time off. If I need money, I can simply make more money. Nobody owns my IP or time.