Helping Humans

Why is it important to help humans to practice stoicism? Why value society? I struggle so much with this mindset. I understand humans are useful for building virtuous character through the suffering they cause but wouldn't it be better to help other animals instead? Or plants? Why humans?

I want to be a good person and build virtue but everything the stoics wrote had in mind that people live in society. However, I feel very detached from society emotionally and, in many ways, physically.

Can I stoic build virtue without other humans being involved? Can a stoic remove themselves from society and still build virtuous character?