So I started playing more seriously (meaning that I bought my own cue and began practising somewhat regularly) about six months ago and every game I played since then, even with my buddies, is not the same simply because of expectations. And every single one of us know that expectations put upon one self grow every time you see your game improving, so being upset when you do not meet them is ,nonetheless, natural. However, the other thing I have learnt is that you should not hate the game, rolls even-out - ALWAYS.
In conclusion. Every human being is a natural winner, well somehow we ALL know the demeanour of a winner, on the other hand accepting a loss due to miss-judgement is a thing not many are well fit to handle. Loosing makes you feel incomplete, undone and when it is comes to crunch time it is better to know where have you been incomplete rather than blame bad weather. Fear a player who knows how to loose.