fatness - sounds like you are playing copy-book style and maybe a bit predictable to your opponent as to what you are actually playing, eg length, length and more length.
It would pay you to have a good read of tactics in the squash library, and also the section "about the opponent".  Then decide where you would start to develop changes in your shot selection. 
My suggestion is to start with Pair Drills/Routines, then Restricted Games.
If you are unable to think fast enough during play, just play as though you are doing these routines in a sort of pattern effect.  Mix it up is what I am recommeding.
And, to make the opponent run, go long/short, eg length, boast, length, length, boast, lob, length and so on - keep the variety happening.....then, later on, you will be able to tailor your game to suit various opponents.  Change of pace is another skill that mucks up a player's rhythm.
You get the idea?  Give it a try......

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don't just watch the ball or the front wall. watch their swing preparation either directly or out of the corner of your eye.

Just before they hit the ball, start looking at the front wall or keep both the front wall and your opponent in either side of your vision. If you've got a good read on the player, you should know whether it's going to be drive, boast, drop, or crosscourt.

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