Good word, SK23; in my mind, working out and being alone go hand in hand, and I didn't think (like usual) that might not be normal procedure for most/other/some people.
I do recommend working out alone and not just *being* alone. If you are, indeed, alone, be doing something. Personally, I require a lot of alone time, because most of the things that I do when I'm not under contractual obligation to be doing something else require alone time, like drawing, reading, etc. In those times I accomplish things and feel fulfilled. In a way, it is exorcism. That is, I think, what you seek.
Simply *being* alone can be awful, because if you are not compelled to do/create anything, then your mind will wander, you become bored, irrelevant thoughts clog your mind. It takes a long time before a person is balanced enough to simply *be* alone and not become bored or distracted. I am not at that point of balance yet, where I can simply *be* alone in meditation or non-thought; my mind begins begging for distraction when I'm not struck by inspiration to work or create and have nothing else on my hands.
But, like SK23 said, being alone in nature is quite different from being alone in your living room or back porch. I prefer forests, but that has to do with my local climate and landscape. There are some very beautiful state parks not an hour away from me, so I can agree that walking trails is an outstanding use of time, and while I'm not creating anything material that I can measure my time-spent value against, I still feel fulfilled. I think this is because, in a forest, I am never really alone. There are not other humans around, but there are many trees, and rocks, and streams, and flowers, and vines, and lizards, and insects, and more mysterious things yet. All of those things make good company (better than humans, much of the time, for better or worse). The most valuable lessons that I've taken from life have not been from mistakes, or books, or teachers, or even family, but from stars, rivers, and spiders.
Again, to concur with SK23, reading ANUS articles has (unsurprisingly, I'm sure) done a great deal for reorienting my perspective. Indeed, I used to be quite the whiny, self-serving little twerp. I still am, in many ways, but I've accepted the promise that there are much greater things to look forward to, no matter what point you think you see yourself in your life.