Your frustration and struggle is caused by a combination of a number of natural human tendencies and subconcious beliefs.
There is a trait inside us all, without which man would never have 'advanced', that craves better.
As well as better equipment and better photographs, there is an undeniable need to display better to your 'rivals'. How much of this need we each have, and how much we succumb to it, varies enormously between individuals.
Next, there is a belief that there is a solution for everything. When it comes to photography, we can barely ever believe that there are circumstances that prevent good photographs, so we don't ever accept the inevitable compromises and reject the reults as poor, even if they were the very best possible.
On this basis, we buy the equipment which we believe will improve our results, never accepting for one moment that you can't take pictures of black cats in coal cellars, while they chase mice at full speed, just using natural light...
Finally (and possibly the worst of all), there is an insidious niggle that is telling you that no moment should be missed; that you have it in your power to capture perfectly every single split second that appeals or is important or any number of reasons. So, when you take your cameras out and come back with nothing that satisfies your craving for photography perfection, you feel that all those moments have been lost forever.
Again, you try to answer this frustration by getting more gear which will allow you to take advantage of more opportunities. Never realising that all this kit creates barriers of its own..."damn, I missed that shot while trying to find the perfect lens..."
Whether you can defeat your own demons is something only you can answer, but to start you just need to remind yourself that you can't ever record evey single moment, that every shot you do take can't be perfect and that no equipment provides a solution to more than just a few perceived problems.
The fact that it is a personal struggle is almost certainly easily demonstrated by the plaudit you will get from friends and family who beat a path to your door every time they want a portrait. I bet they never notice any of the problems that haunt you, in terms of noise and pin-sharp focus!
Don't beat yourself up over it, perhaps take a rest and enjoy time without a camera, and the passion will return. Just remember that every picture has flaws, it is only important whether the other man notices!
Anyway, I'm off to buy that 135/1.8 that I absolutely have to have...
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2011 : My new year's resolution -
To be positive, not negative.
To help, not to hinder.
To praise, not to criticise.