I would give him more time to come around...being shy is a temperament thing and he can't help it! When he comes up to you and just stares at you, I would ask him if he'd like a hug! This will help build the relationship. And are you saying to him "Apologize"? or are you saying "Say sorry" Because if he's not even 2, he probably doesn't understand what you're asking him to do...my son wouldn't know what to say if I told him to apologize to someone. Encourage him in an upbeat way to interact during games but definitely don't force him, or keep asking him to come play...he'll come around when he feels comfortable