By putting your finger on the trigger, the trigger safety should be released as you pull. Look at the safety, which is a small flat piece of plastic (see photos), at the top rear of the trigger. Watch it as you press the trigger, it should move up and allow the trigger to move rearward. If it is working, as designed, then all is good, except for how you are placing your finger on the trigger and or pulling.
I agree that it should be a natural placing your finger on the trigger and pulling back. This sounds like possibly the use of an improper grip, or starting the pull from the top of the trigger. The pull should feel as though you are pulling straight back, not down and back. A straight back pull should feel more comfortable and also make for less pulling pressure to move the trigger (lower pull gives more leverage to the pull). You are likely placing your finger, or too much of your finger, on the top right portion of the trigger, to begin the pull. The proper placement of the finger should be near the center of the pad of the finger to the center or slightly below center of the trigger face. I have large hands and on a small gun, I have to place my finger low on the trigger.
These guns are designed for a straight back pull, and this allows the trigger safety to be easily released. The bottom of the trigger only moves about 1/8 inch and the safety is released. Then the rest of the pull will move both the lower and upper trigger together. The shape of the trigger and safety should naturally place your finger in the proper position, for the trigger pull. You just have to be aware that as your finger wraps around the trigger, you may be pulling from the top right portion of the trigger.
The photos show that the bottom of my Shield's trigger has a slightly different shape. I have molded in extra material to create an over-travel stop. This along with an Apex sear and striker block gives me 1/8 inch of lower trigger movement (trigger safety), then 1/4 inch take-up, 1/16 inch pull to break, and a 1/16 inch reset, with no over-travel.
Link to 1 minute video of my trigger pull:
http://www.youtube.com/watch?v=T60sTwJ_FNE
Bob
Bob