1) Not focusing on every shot on every hole. This leads to bad shots that I don't need
2) Not fueling up with food and water when needed to prevent me making a mess of shots and holes cos I am hungry and dehydrated
Get a reasonably repeatable swing then go out and get fit for clubs.
Unless you have plenty of money to burn...…… Great advice from @ChetlovesMer
My 1st 2 years, I put a set together from the local goodwill type stores. Cost me about $60.00 Once I decided to continue, I went to a local golf specialty store and tried out about 10 different sets of used clubs that some one had treaded in. Fount the set that "felt" the best to my swing and picked them up for about $200.00.
Used the cheapest ball I could find at Wall mart, until I stopped losing so many...….
Played the used set for about 3 years before I invested in a new tech fitted set.
Still not sure how "reasonable" my swing is...…… LOL
All flaws that you possess are common with your miss; high and right. Shoulders are open at address, flying right elbow, coming over the top, and chicken-winging through impact. Move your ball back an inch or 2 in your stance with your driver. Right now its align with your left big toe. Play it inside your heel or off your left chest pocket or logo if you have one. This will square your shoulders better. Swing with a headcover or towel under your right armpit and don't let it fall out at the top of your swing. You're also sliding. Look at your slo-mo vid from head-on and look how far your head moves on your takeaway' 6 to 8 inches. You gotta lot of work to do but all in all not a terrible move for only playing a few months. You're big and strong, just gotta learn how to use that speed to your advantage. Please go see a pro and get some lessons before muscle memory sets in and your bad habits are hard to break.