Congratulations on creating a MySwing thread! Unfortunately, that's probably the easiest part of getting better at golf. The good news is there are plenty of people here to help!
You might want to check out this thread:
The one thing I want to point out for you in the future is that your camera angles are a little off. It's not going to matter so much right now, but for the future, the proper angles are important so that we can observe what is really happening in your swing without distortion. More on that here (this is also linked in the thread I posted above): http://thesandtrap.com/b/playing_tips/filming_your_swing
Are you familiar with the 5 Simple Keys? If not, here is a good place to start:
You're having problems consistently hitting the golf ball because your Key #1 needs work. That is your priority piece at the moment. You move your head back and away from the target quite a bit during your backswing, which basically changes your body's relationship to the golf ball from where it was at address. In order for you to hit the ball well, you have to move your head back forward during your downswing, and the rate at which you move your head back will vary slightly from swing to swing, thus leading to your inconsistent contact. You have quite a few pieces that you do fairly well, so I think getting that head movement eliminated will clean up a lot of things in your swing right away.
I would start with a little setup adjustment. First, your grip is a little on the weak side. More importantly, you should flare both your feet outwards and bow out your knees (a little as if you were riding a horse). The foot flares and turning the knees outwards allows your hips to move more effectively in the backswing and downswing. You can see in your backswing that you roll onto the side of your right foot, which is part of the reason for your swaying. Flaring the right foot will help you do a couple of things that will keep your head from moving back so much.
For the actual movement you need to do in your backswing, you need to turn your more downwards towards the ground instead of backwards away from the target, and your right shoulder is going up and around behind you. When you get to the top of the backswing, you should feel like your entire right side is stretching.
For a good drill, imagine someone is holding a hula hoop around your shoulders (or better yet, have someone actually do this), perpendicular to your spine. Make your backswing by tracing the hula hoop with your left shoulder. It's going to feel like you are turning your shoulders pretty steep because you turn them too flat. Turn your left shoulder down and around in your backswing instead of away from the target.
Sorry, it got a little wordy. Hope it helps.