To King Saul's credit, he did try to equip David some ill-fitting armor and gear. However, David decides to use what he knew best- a slingshot and some stones. In the end, God took David and used him just as he was- a kid with a keen eye and makeshift weapon.
Do you feel ill-equipped to take on life today? Perhaps it's not that you need to be any different than who you are. Maybe what you really need is a willingness just to step out on faith and trust in a God who's bigger than your giant. Face your fear as you are, leaning on him, and watch your courage emerge. The reality is that your giant, whatever or whoever that may be, is not as big as you think. And you are bigger than you know.