Summarize the story below using Somebody, Wanted, But, So, Then.
Timmy the Turtle was excited about the annual forest race. He wanted to prove he could be fast, even though turtles are known to be slow. All the animals laughed when Timmy signed up, especially Robbie the Rabbit, who was the fastest animal in the forest.
On race day, Robbie ran ahead quickly but soon got bored and decided to nap under a tree. Timmy kept going slowly and steadily, without stopping. While Robbie slept, Timmy passed him and crossed the finish line first. Everyone cheered, and Timmy proved that determination matters more than speed.