I suck at sports what can I do?can i still join the army? haha?

Find a sport that you like even if you are terrible at it. Watch some videos of that sport and start training. Eventually, if you try hard enough, you can get good at a sport. I myself was terrible at soccer until two years after I stopped playing it. However if you like to run, you could do that as well. Running is still a sport even though it isn't quite as competitive as other sports. Biking can also be a lot of fun as it can be used to commute to somewhere. It's very versatile as you can bike off-road or on. I'm getting into running also and experiencing Runner's High is worth all the time and effort.