I think there was another thread on the whole - carrying the QA with the gun decocked. If you are not comfortable carrying a round in the chamber, then maybe you shouldn't be carrying. I too had some "issues" when I got my 1st gun in 1993 - a Glock 17. But, after having it a few months, I became more comfortable w/ it, and started to keep a round chambered.
Please realize that there are several realistic scenarios which may require you to use a gun in self defense - and, quite often, U are lucky to be able to even bring the gun to bear in time. By you assuming you will have enough time to cock your gun - I think U are making a mistake in carrying it that way. The QA decocker is not designed to be a carry safety.