Dear Forward Only (plus Chocka and the fishes I guess)~
I see you have already started out by helping others, that says a fair bit about you - thanks.
I guess yes you are isolated. You feel it. Being on the internet or phone is part of interacting with others, but only part. Enjoyment of fact to face contact is needed too.
You mentioned that sometimes you are relaxed on your own, then you change and feel the lack, wiht the idea everyone else is getting on wiht their lives and excluding you. OK, so the first part, chosen solitude, is fine, but the second part is isolation, something you sound as if you need to overcome. Not surprising really, most humans need others.
Maybe you have developed a pattern . I would not know why, but relying upon phone and internet sounds like you are avoiding face to face contact, at least when you want to feel more comfortable.
I think if it was me I'd suspect i needed help to interact with people and enjoy it. May I suggest that you not only talk here, where others understand from their own experiences, but have a long consultation with your GP and talk about this habit. It may be based upon anxiety, fear of rejection or something like that. I so not know, I'm no doctor. I do beleive it is worth a try.
If phone and internet are more comfortable then I'd expect over time you would use them more and rely upon them more too. As this can lead to more and more isolation perhaps you should be lookng to increase personal contact instead, and maybe medical help will make that easier.
What do you think?