Yeah I think that you should study some openings, your tactics rating is high, but making bad moves in the opening and trying to reinvent the wheel under time pressure. I think I would have played Bc5 instead of Nf6 then if he takes the knight you threaten the scholars mate and he gets absolutely nothing out of the opening.
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I played and painfully lost 2 X 10 minutes blitz game. Common theme was getting saddled with long term weakness in form of double pawns which compromised king safety and allowed "zero" counter play in the end game.
Game 1:
Game 2: