Why did Germany go to such lengths to destroy British power?

Germany had a lot obstacles in its path for world domination, and Great Britain was the gauntlet. Great Britain was the most powerful naval fleet in its time, and Germany's only way to transport its havoc, was by shipment. Germany had a hard time stopping its foe, and always got let down. Britain was just to advance for them. Britain also had many countries under its name, and they could call many men in those countries and the numbers would rock Germany's number anytime.