For 6 months you are doing well. But I'm worried you are not having much fun. And the advice here will be very technical. You have the physique of a golfer so I advise getting a few lessons to get the basics down.
But in the meantime have you ever tried to thrash the ball for fun? I mean really swing at it. It seems like you are afraid to hit the ball. Don't worry you won't break them. So do your controlled drills and practice but leave some balls at the end to have fun with. Its important you get the feel of what it's like when you connect with a driver at high speed. Its amazing.
Its important to conceptually understand the driver is a whip, not a stick. You have do what ever possible to flex the shaft and let it snap straight at impact. Do this drill. Start with no ball and just swing away back and forth, back and forth, one motion. The goal is to create a swoosh sound at the bottom of your swing. Build this up faster and faster. Your back swing should be slow but your downswing will be quick and through. It should go so fast your arms become extended at the bottom and the club almost comes out your hands. (don't worry if it does, I've done it many times) Feel the weight of the club head. Whip it with your arms and your wrists. Back and forth, back and forth. Feel how your body has to flow with this movement. Everything is connected. Now you are swinging freely. This will loosen you up.
Now place a ball in front of you and repeat the swoosh sound where the ball is. Don't worry. The balls will go everywhere. And you will often plain miss it. But 1 out of 10 you will hit the middle of the club face and ball will fly. Its the best feeling in the world. Have fun with this. For now who cares if it slices or hooks. You can learn to control that later. Get used to hitting the middle of the face.
It will take a long time to get the fundamentals down but, like Bubba Watson, sometimes you just gotta feel it.