Your driver shaft sounds either too flexible at tip, shaft too long, or maybe too heavy a swing weight? You should always get fitted by a pro for: length, lie, loft, shaft weight, shaft bend point, and club swing weight (which most don't do). You should always be able to feel the club head on the down swing with any club. Look up you driver specs: grip weight (low good), shaft bend point (high good), club swing weight (D2-5 good) , & shaft length (44-45 more accurate). You can go to the range to figure out club swing weight. Add lead tape near the grip = lowers SW, or add it to the head properly for increasing SW. You have to be more fit to swing higher swing weights, they will tire you out more over 18. Good Luck.