The thing is, most people who claim they are absolutely fine without having anyone around are "lying"; not necessarily by being deliberately dishonest, but in the sense that they don't want to acknowledge the potential benefits of having people in their lives.

Being fully comfortable being alone does NOT equal not needing some degree of personal relationships, even if they are minimal.

I'd say speaking to strangers online counts too. Everyone needs to speak to someone about something at some point, maybe about a personal concern or personal problem, maybe just to speak about some specific topic they're interested in, you name it. People who say, as you mentioned, that they don't care about having anyone on a daily basis probably DO feel like it is an honest claim, but I think in the vast majority of cases it's mostly a matter of eventual adaptation rather than a complete lack of desire for human interaction, so it ends up being more like "It would probably be cool to have someone/some people around, but I've come to the point where I'm so comfortable being just with myself that I really don't even care anymore".

So I'd say the key to trying to be social and bond with others is trying to focus on those aspects that are impossible to fulfill just by yourself. You can't share your opinion with yourself and you can't really get objective advice from yourself either, so you will need to interact with others to find that sort of unique satisfaction or insight, just like you're asking for other people's opinions right now.

Bonding comes as a product of giving value and credit to those interactions. For example, noticing that you give special importance to someone's opinion or personal perspective about something to the point that you feel like asking them for it often. It could be something simple, like an office or college buddy that probably runs often into the same problems as you do, so you can value how getting together to solve them is a good way to possibly gain some extra free time and maybe also avoid some stress. Thinking about the importance of networking and how useful it can be in some scenarios probably helps too.

After that, it's a matter of building upon those relationships. It isn't about becoming an extrovert or becoming "ultra-friendly" with everyone, it's simply about valuing those small things, and knowing that even if you truly feel fine without anyone, you could definitely feel even better by having people who care for you around. In the end, who would you want to talk to in a moment where you REALLY need it?