Do more drugs.... I found methamphetamine to leave me feeling high, manic, energetic and I definitely didn't have any time left over to feel alone.... I also had the cleanest place ever, my second tweak of choice is to get all OCD over germs and dirt...
Actually no... All the substances I ingested, injected, snorted, inhaled, whatever only buried crap and after about a decade all of that crap along with that decade of new crap vomited out sort of like the girl in Exorcist vomited.
Nearly all of us feel lonely and get down in the dumps from time to time.
Down in the dumps - well for me that is a yearly scheduled event due to SAD...
I have found that distractions like building stuff, or creating stuff, or even killing time on the internet looking up useless crap such as what it was that the Romans Wore under their tunic... Or how to reduce ashes and water to make lye and then how to combine that lye and rendered fats into soap.... totally useless data in a world were soap is sold everywhere.
I have also found that making small, reasonable goals in other stuff other than 'I want to be happy' and working toward reaching those goals helps.
This year I set a goal of expanding my veg garden with a decent patch for corn. Right now I have 6" high corn in my new patch... I set a reasonable goal which had nothing to do with 'happiness' or being a lone, or dealing with depression. The reward is I feel happier about myself because I did 'something' constructive and I can go outside and look at it any time I get in the mood or the stance I do nothing.
Of course it also gave me a bit of exercise (you try spading a patch 6'X8' and tell me its not exercise)... and it put me outside for a while, it also took my mind off of everything else for a moment.... One can set a lot of tiny goals similar to this and get a lot from them.
If this down in the dumps feeling is actually depression and has been going on for 3+ months, I strongly suggest you bring it up to Doctor and get yourself a therapist. If there are stresses in your life which are leading to sadness, then try to figure out a way to either live with the stresses, or to get out from under them.
Also bring it up with doctor you are under stress. I understand they have pills for that, and for short periods of time (a year) being on a prescription drug to deal with 'stuff' isn't bad - as long as you are working on fixing the stuff and not using the drug (legal or otherwise) to hide from whatever.