Just like in Tetris, your only real opponent is yourself. Try to improve versus where you were yesterday versus focusing on outplaying the people around you.
You can't see into the future—just the block ahead. Focus on making the best decision for where you are right now.
The act of playing itself is what's fun about Tetris. Stop focusing on winning and just enjoy the game itself.
You get to pick the game you are playing, so why not to choose a fun, addicting, guilty pleasure. Tetris, I love you.