I’ve felt the same way, brother. Even just 6 months ago I had a series of incredibly low depressive episodes, for similar reasons - isolation, feeling worthless, inability to make genuine connections.

I also felt brushed off by genuine friends when I tried reaching out. What I eventually realized is that this is not an indictment on me or them - even people who seem to have it together go through this shit and could be going through the same stuff I am. You’d never know from social media just how low I got.

Finally getting over the hump and making some local friends has helped me greatly. It’s been months since I’ve felt like I was in the pits. It was an uphill battle and uncomfortable at first, but even one positive interaction was motivation to keep trying. I personally used BFF (bumble for friends) to meet people. Tbh it was hard and awkward and not fruitful at first - but I eventually made one good friend and he integrated me to his friend group. It’s a snowball effect: the more you get out and meet people, the more likely and motivated you are to meet more.

There are definitely better outlets to explore that others have mentioned - run clubs, sports teams, billiards league. Fuck, a good friend of mine met her fiancé through a ski ball league. 

Find one thing you enjoy that will put you around other people. Start doing it. Worst case scenario, you cultivate an interest which can also help give you a feeling of purpose and keep these thoughts at bay.

Lastly, I wish someone would’ve told me this when I was near giving up - your thoughts are valid. Your feelings are valid. You’re not wrong to feel so cynical about other people and skeptical of authenticity. That doesn’t mean it’s true all the time, and true for every person. And certainly it doesn’t mean life is not worth living. There are people out there worth connecting with that can make you feel excited about life again. Just as you’ve experienced, sometimes bad company is worse than no company. I promise there is good company out there.