It's important (for people in general) to remember that being alone and being lonely are not the same thing. Loneliness sucks. I know, because I experience it a lot, too. (Either from way too much alone time, or from being in the midst of others and feeling disconnected.) For me, the internet helps for sure, but much still remains, unfortunately.)

Sometimes, being alone can be in a sense of choosing to be alone for thinking and reflection. That is a good thing, and would best be described as solitude. It's when we [i]don't[i] want solitude or to be alone that that it can be loneliness.

Also, one can find being alone unbearable and feel the need to have someone else around all the time. That's not good either. It seems there are 3 variations (maybe more) on the theme.

So yanks, to your question, I'd have to say that I don't deal with it particularly well. BUT, sometimes handle it ok. Those times, I find are based in reframing, which puts it more in the "what would I like to do that others may have no interest in?" This time can be used to actually do them! Silly example, but here goes. I've always wanted to get an all day bus pass and travel around all day, simply to see parts of the city that I don't already know. Being able to kick back and actually see in a way that driving would not allow.

So, reframing maybe? Seeing it as a freedom? It might not exactly "solve" it, but may usefully pass some of the time, and you never know, could open an opportunity or enjoyment that might otherwise be missed.