It sounds to me like your weight is not coming forward enough and you are hanging back, or, that your head is coming down on the off side of the ball, (this would lead to a lot of half-strides and being hit on the pad, inside edges, and a lot of shots square of mid-wicket)
I would not suggest changing the trigger. I only know a few batsmen (inc. myself) who do not use a trigger. just make sure that your weight is coming forwards on the line of the ball. I would suggest starting with spin. I.e. forward press, and then look to play through mid-off (drill) and likewise, with seam look to play through mid on (straight bat) in order to do this, your weight must be spot on.