"...how to be angry at the world"
Step 1: Don't be angry at the world, you must realize is useless to do that, is completely pointless and a time consuming endeavor.
Step 2: Don't be mad at your friends, that's something really stupid and selfish to do. You can talk to them about your problems, but don't overstretch it, nobody likes a winer.
Step 3: Use that anger constructively, yes, anger is good, it can make you break things, but it can also help to smash your way through life obstacles or just to awaken you from that state of pithiness.
Step 4: Remember to enjoy life and that limits can be smashed to pieces.