If you don't use The Holy Four (WASD), you will never become a true PC gamer. Try to get yourself used to it. Remember, W to go forward and S to backpedal. A and D to strafe. When using the mouse to turn, this is a deadly control scheme and you'll have much better control over your character. You will be able to turn as fast or as slowly as you want. You will be able to move sideways to avoid damage, or to get better control while flying through the air.