Anyone feel isolated/lonely?

I’m a 27 year old bloke, I work a lot. And I’ve always felt isolated/lonely. Made me realise that most of my friend I made from school drifted away and only kept one. Most of my friends are from work, which I don’t mind but… kinda feels a bit sad. Like all the time I’ve been alive I basically have work friends and through sheer amount of time spent together became actual friends. But only one friend outside of work. Madness.