>>1307>I used to be overly nice to everybody … ended up with those people fucking me over
Sounds like "nice guy" syndrome. You were expecting something in return. To get that 'something' usually requires that you possess social capital (ie, something for which you're respected or desired by your peers.) Whether it's true or not, showing deference-via-niceness signals to others that you lack any capital, which is why when the chips were down, you didn't matter to those IRL people. And it's not necessarily because they're just shitty, either— social capital includes stuff like useful real life skills that are necessary to a functioning society, and social circles are a microcosm of the greater society.
tldr, you were nice, but you probably weren't compelling (in terms of personality, the way a popular youtuber might be) or indispensable in practical terms.>Nowadays I'm super bitter and I don't trust people enough to let myself be nice to them,
Basically, you don't trust yourself to handle being deceived, mistreated, etc by hustlers. And certainly, bad outcomes should be part of the calculation by which you decide how to deal with people, but you overestimate the cost, probably because your approach hasn't been working for you.
You don't need to become hard-hearted. Just recognize what people actually want out of life when you interact with them. Maybe read "how to make friends and influence people" which can probably help you more than I can in reframing the way you think about these things.