I am in a weird position, in that I have enough mental illness/personality issues that I literally cannot date without risking my sanity. I get very attached, very quickly, and when things go wrong (as they do), I get devastated and suicidal. So, boo. I will end up as someone’s crazy auntie, I’m sure.
I have a small group of friends, and my mom lives with me, so I have some companionship. We have two cats, who are incredibly spoiled. To the point of which we rush around opening the window shades so they can get the sun by 8:30am, give one of them treats (but not the other; for some reason he buries them?), change their water like 10x a day, and tolerate the bitey one because A) he loves me dearly and B) if we tried to rehome him, with the biting issues, he would almost certainly be put down.
Anyway. People and pets help, but sometimes they’re either not available, or not enough. That’s when you have to get yourself some hobbies/distractions. TV’s okay, but it doesn’t tend to fully hold my attention. So I have needlework, sudoku, video games, reading, etc., along with surfing the internet.
You will be amazed at how much fun Tumblr is if you filter out all the porn (YMMV) and social justice posturing. My feed is nothing but cute anime and Pokemon pictures, movies and TV shows I like, and Tom Hiddleston. 
Also, be open to stuff that may seem crazy at first glance. I was considering signing up for an online Pokemon tournament. (They have divisions that separate the kids from the adults.) But: I’m a 43-year-old woman; I’ve never played in a tournament before; and my Pokemon are nowhere near ready. Still, somehow, I couldn’t get the idea out of my head.
You know what? I decided to do it anyway, and it’s nearly all I’ve thought about this week (tournament starts Thursday evening). I am so frickin’ excited, it’s unbelievable.
And I say this as a person with a history of depression and apathy - it is so hard to care about anything sometimes!
Is there anything you’ve wanted to try, but held yourself back from, because it seemed “silly” or you thought you’d be mocked for it? Preferably that won’t bankrupt you, hurt you, or put you in danger? My gosh, go for it! You may not necessarily meet people to be your best friends, but you may well have an experience that will keep you buzzed for days.
I wonder sometimes if a lot of things we do are primarily to distract ourselves from our loneliness? If so, we might as well take advantage of the opportunity to try something fun and new, I guess. 
Note: I hate trying new stuff, so I’m tickled when it works out. It’s like the best kind of reinforcement for taking a chance. Best of luck to you. 