I think it's not possible because we all affect each other, we create relationships with everything and everyone.
But if your question is focused on living "alone", then yes it is possible and "forever" as well, the issue of loneliness is knowing how to live with yourself
It would be interesting to live alone, in complete solitude, perhaps on an island and try out how one lives with oneself and realize if that is what one wants
There is a documentary that could be useful to you called: The Swedish Theory of Love. It shows the life of many people in solitude and the consequences that it brought to that country
Regards, be well