Is Today is the time or shuld i give up.?

I was cut freshman and sopre year and i didnt tryout junior year. So this is year is my senior year and i have couple of months to practice my bball game and get better so i can start this year. Im going to stop being lazy, think positive, always look foward and accomplish my goals.. i dont care if people say im not going to make it to the NBA... im only gunna believe in myself... So should i practice everyday and improve my game and help my high school team to the championships or shuld i give up and die this summer?