Not seeing the simplest solution

This has been a theme for me for quite sometime, and it has had a very negative impact on my chess growth. I am always trying to overcomplicate things and I miss the obvious. To add insult to injury, half the time my deeper and more complicated variation wouldn't have worked anyway.

Here is an example from my latest win of how I miss the simple and see the not-as-simple (my opponent resigned after 34. Qe8+):

The win my opponent saw, and the one I missed completely, was the simple Qg8# (or queen blocks, queen takes check, Qg8#).

Why does my brain do this? Is this normal? I would also like to point out that while in this example the more complicated line would've also won the game, there have been a lot of times I have done this where the more complcated line didn't work at all - and I missed the more simple line that would have. So it's not that I see far - it's that I have a tendency to overlook the simplest of things and it is affecting my chess growth and costing me wins.

Does anyone else deal with this? How do I stop it?

12 fxe was getting a free piece, and going back to the question, maybe it is the time control?

Yes, I missed winning a knight for free early in the game and even made a comment to my opponent about it.

Time control has nothing to do with it because it's online chess.