I've owned a Glock 19 for about 10 years and it is an excellent gun in most respects. But I would agree with you on the feel of the grip.
The G19 grip tends to be rather rectangular in cross section, rather than oval, so it doesn't fit the human hand as comfortably as the grips on some competing guns. It has these fairly sharp corners that you have to wrap your hand around. I have always thought that the grip on some other double stack 9mm guns was more comfortable, such as the Walther P99, the H&K USP compact, and the Sig P228.
There is a small industry of gun modifiers that will offer to reshape the Glock grip to make it more pleasing to your hand.