I haven't read all of the above threads.
I go out seeking solitude, so I do a lot on my own. I actively avoid groups if I can. I know that as a loner If someone said to me "Just go, and embrace the group experience" I would find it next to impossible (I've tried) and such advixce would be useless to me. Therefgore I imagine that telling a sociable person to "embrance the loneliness" is equally useless.
One thing I do find though is that after my trip I am always keen to tell others all about my adventures and experiences. Perhaps something you could do on a solo trip would be to take a notepad and record your activities, and prepare the stories that you will tell your friends on your return. Even better would be a voice recorder so you can speak aloud whilst you do stuff, which would offset some of the isolation that you might feel, or even to video yourself with camera or phone, so that you feel that you have an audience. I know if I am preparing for giving a talk or presentation I will rehearse it aloud whilst I am alone, as if I had an audience in front of me. That, plus your music, might help. Imagination can be your friend here. instead of thinking about your isolation, pretend you have people with you. There's no-one there to see you so who cares if you look a little mad or feel a little silly? If it helps, go for it.
Finally, if you have mobile phone signal, you can text or even phone, so you are no longer as cut off as people used to be.