If possible I would like to have an explanation on the mistakes I made thank you very much 
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You played too long in the lower left area, threatening to cut of a group which is rather strong an alive.
So this is not a threat. You should have played in more open spaces. For example surround more territory around G14 or play at the left side before your opponent does. Your opponent got both of this places. That’s the reason you fell behind.
I left a quick review. Sebas74 vs. Tsukuyomiii
Enjoy~