I understand your perspective, but it's narrowly focused on the ugly parts of life.

I agree that the capitalist system is sickening and that people are too complacent in general. But the fact that you think there are no good experiences to be had with other people because everything is transactional is alarming and a sign that you lack a healthy network of friends, allies, and lived cameraderie.

By the way, being nice is not altruistic. It's something you do to avoid conflict. If overdone it will erode your sense of self.

I think your gut feeling is spot on, but your response to it is maladaptive. If you want to feel joy in life again, get involved with people who acknowledge that the system itself is broken and who strive for revolution, so you can join them in your common goal and feel a purpose in life again. Those people usually also know how to party and cook great food in my experience.

Your suicidal ideations are not a sign that people suck, but that you need to find yours.