This is my first sport airsoft gun, and it is pretty powerful... I was able to shoot through 8 layers of construction paper and dent a thick can with it, but when I shoot it, the BB curves upward instead of downward until it reaches maybe 70 feet, and I can't seem to hit anything that is flat on the ground because of this... Is it because it's barrel is smooth?

So far, I have learned that I if I want to shoot
someone in the balls something that is 25 feet away, I have to aim
right in between their knees around a foot below where I want to hit, and the BB will curve right up into
them the target.