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They're not your friends, even if they act like that.
The management just sees you as expense factor and does not care about you except for how to get the most work done for the least amount of money. Your team leader does not care about you and only cares if their numbers look good. Your colleagues do not care about you and only see you as competition or the idiot they can give their work to.
If someone is nice to you they want something from you not because they like you.
I'm so sorry you see things this way. I just left my job after many years at the company, and while my goal wasn't to make friends I definitely ended up collecting a few along the way. I was in upper management and definitely cared about my team, and so did the directors under me. I befriended some of the people in the C-suite as well. They threw a nice, big surprise going away dinner for me, which they definitely didn't need to do. I've met up with former coworkers in other departments to catch up, because we genuinely enjoy each other's company. I hope you find a place that values you and that you can find a friend or two that you can keep in your life.