Of course there is some competition and this is especially true within species and as related to sexual concerns. But life cooperates to fill every niche and to maximize the total amount of life in every place. In the big picture life is about cooperation though as you say there is a lot of competition as well. Species "compete" for food but just like birds of a feather taking turns at your feeder there is plenty to go around. When the jays are on the feeder the cardinals are on the hostas. It all gets eaten and nothing truly goes to waste.
Most of what men do goes to waste but
homo omnisciencis is the odd man out. We are out of step with nature and don't even understand the concept of "consciousness". To us nature looks like survival of the fittest, competition, and death itself because of the way we think. In order to attempt communication with so much knowledge we must use abstraction and think differently than every other individual in nature.
Yes, competition exists and is important but it is not a defining characteristic of "life" but rather the nature of individual consciousness.