Individial well-being

If there are economic externalities such that an individual persuing their own economic interests will have unconsensual negative impacts on someone elses economic interests, it seems that if one were to give up economic persuits in their own right and focus on individual well-being that there would be well-being externalities. But, this may not be the case because one person having well-being does not detract from another person's well-being, whereas my having of one dollar prevents someone else from having it. But, that has nothing to do with anything. If I seek personal well-being (whatever the fuck that means) then won't I have negative impacts on other people based on what I'm doing? Yes. The hunt of any deer will tread on some grass. However, grass grows back, and so long as I'm not 4-wheeling it through other people's lives, I think that overall it's not a big deal. Especially since I live in this forest and cultivate these friendships such that I care fully and deeply for all it's parts.