Why am I so dumb

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Kenji129_4

Sometimes if I lose (in OTB), I feel so bad and dumb. It seems like I am seeing ghosts every time in the simplest positions. 
I got into a position like this:

Not the excact positionHere: Qh3 (e1 in the half-chess board) is just the easiest mate (f6 or Re8, then Rh8+ followed by Qh7
Instead, I played Rxg7??????? Kxg7 Qh3 and now Rh8 is possible. I obv saw directly playing Qh3 sequence, but I somehow miscalculated the counterattack of my opponent. I was so dumb that I thought black had an extra tempo and Rh8+ wouldn't be a check or smth. Then I suddenly played Rxg7 without even properly calculating. It just happens sometimes automatically, I don't know what to do. 

Leto
Its problem of your counting discipline. Try to recall your thoughts. Why did you take this decision?

Or. Maybe answer is simple and you had 5 seconds on your clock.
MAKYKONDRASHOV

happens to me too but i have taught myself to think out every move i do

130jack
You are not dumb. Just keep practicing and playing. You will get better.