That room looks way too good to be hitting a bag in

But still you certainly aren't the worst mate, you just need to practise each punch individually first. Start with the straight punches, 2 rounds of jabs only, 2 rounds of rights only then 2 rounds of straight punches. Try that for a couple of weeks. Pay special attention to your footwork and hand position, as if you get taught incorrectly now, the bad habits will be even harder to break. But keep it up mate, you looked good, just remember no one is born a champion, they are made through hard work.