pressure of time....
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I'm a good chess player but i lose too many games by the pressure of time how can i play fast.....
Play quicker games.
For example, when I was playing a lot of 5-minute blitz games, 10 minute games feels slow (and 30-minute games feels like an eternity). Now that I mostly play 30+ minute games, I just can't handle 5-minute games anymore (I'd either make terrible moves because I worry about time or I just run out of time).
I remember that I used to calm myself in a long game when I'm down to only 5 minutes by thinking to myself: "hey, don't sweat it, that's enough time for a full game". Although I still do, but I'm only fooling myself (can't play 5-minute games anymore).
So, in order to get better at short games, play a lot of shorter games!