Sounds like you've been surrounded by extremely shitty people, I'm sorry about that. In a world where we're conditioned to strive for our own success, people tend to forget that we're social creatures and need to support each other to thrive.

My approach is to be as warm as possible, with the hope to inspire that in others too. Often fails, sometimes it doesn't. Not saying it's something you should do, because it requires a lot of energy and often ends in pain. But it's an option.