Why do I feel like I can't fit in well in social communities despite my efforts?

On online communities, for instance a lively, active community I feel like I struggle to naturally blend in with that community, even if it's related to something we have in common. And on online communities were I do blend in more, are usually more inactive and occasional posting. I managed to make one or two friends from communities, which is very rare because I'm not used to being liked or related to. In the past when I have integrated into communities and developed myself there, it usually ends bad for me, with me having to leave either temporarily or for good. A lot of it has to do with the fact that I barely try to talk in these communities, mostly because everyone already knows each other and they're either already a clique or separated into different cliques and gatekeep themselves. Another reason is just, I don't generate engagement as much as others do, for saying little to anything basic.. Do I lack initiative, am I just too socially awkward or is it just bad luck? People might say you just have to keep trying and find a community, but after a few times trying and going back to square one, alone with fewer and few acquaintances, at what point am I supposed to wonder when it's me. I don't know what to do. I used to not care, and just mind my own business. But after my most recent friend that has gone inactive and left me with the impression that they outgrew me, I missed being part of something. I go back to looking I guess. Based on my odds, I'll end up exactly where I started. And, I'm an introverted person. I'm one of those introverts that needs twice as much alone time to compensate for a little bit of socializing. But unfortunately, a small sample of positive outcomes from socializing, as small as they might be, are just bad for me, being in this state of perpetual social absence. I'm not one to ask for social opportunities. It has to flow naturally. I just happen to not be a flow-er. And at my age, I wouldn't even know where to start.

Why do I feel like I can't fit in well in social communities despite my efforts?
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