Why am I so terrible at all sports?

Ever since elementary school Ive always been the last person to be picked for teams. So I got a basketball hoop to practice and I literally practice for 2 hours a day and when I play basketball I can never make a single basket when I play with other people. In football, the guy with the ball runs right past me, I get juked every time. When I get a hold of someone I can't tackle them. When I have the ball, I get tackled right away and can't run faster than anyone on the field. Even in sports like Ping Pong I get destroyed everyone spikes the ball on me. I exercise and practice for hours a day and Im the worst one in the hole school at sports. How can it be possible that someone can be as weak and bad at sports as me? According to Darwin, only the strong survive, so how did my ancestors survive? What can I do to become more of an athlete?