He had issues connecting to people. His dad beat him, his new dad was a rich Brit in a classist society, his mom was dead, and he had no real friends. JoJo was the only person he respected, but since they were enemies, he had to fight him.
So basically his problem stemmed from the lack of social services and counselling back in those times.
No wonder he took Jonathan's body, the respectable alpha figure
Being completely honest with you, yeah.
If he'd not been adopted by a SJW faggot liberal, he'd have been in the poorhouse and would spend his time between doing menial labour getting out being drunk before dying in his mid thirties. Had Dio been subjected to period correct Britain, he'd have either been put in the slammer or poorhouse before dying off.