a) Yes, everything is indeed pointless / "pointless".
b) Think about what "pointless" means. It requires an agent to assign and remove importance. Who is this agent? Is it you, is it society, is it what you have been told since born? What's his goals / values / pov? Why exactly is something "important" or not?
c) Fck "saving the world". Fck "there is a point in this". See it, start, simpler: Do you enjoy eating some specific food? That's the meaning of life. Do you enjoy taking a dump? That's the meaning of life. Do you enjoy chewing gum? That's the meaning of life. Do you enjoy saying some arcane joke? To yourself or some random person you just met? Even if they dislike it or don't understand it? That's the meaning of life. Do you enjoy scratching your @@? That's the meaning of life.
The "purpose in life", is to eg scratch your @@, and for 2 seconds, say "I liked that, and I currently feel good".
It may sound ridiculous, but everything comes from that. If you eg say, "I was thirsty, it's hot, and I enjoyed this cold glass of water", you are on your way to be happy, and also on your way to save humanity. If you want to do that. ..Don't believe me that everything comes from that. But, pls, do enjoy the one second of today, that you felt well doing whatever.
That's the meaning of life. That's the purpose. And when you internalise that, you will find something that is nice for two seconds, and, eventually, you will find the "purpose".