These top tier games have commentators for a reason, they are played at such a high level it can often be difficult to tell who has the advantage at a given point, or if any advantage exist at all and the game is headed for a draw. You are certainly not alone in that sense.
That said it's definitely possible to improve your understanding of games lightyears ahead of your own level. Your brain is more than likely up to task, just untrained like you suggest. When you see these players play bullet chess online, just blitzing out the moves to such a high level, you might say they don't even think about their moves, and you'd actually be right. In these short time controls it's mostly about pattern recognition. The best players who have played since childhood have all these patterns crammed inside their mind. It's second nature. Whereas a beginner might use ten seconds double checking if their queen will be safe or not, or spend a minute figuring out how to maneuver a knight to a more suitable square, this is time better players will spend on actually figuring out how to win the game. With practice, these patterns will form inside your own mind so you won't have to think about all the trivial stuff, but start looking at plans and ideas.
