Glocks can come from the factory with various combinations of connectors and trigger springs that will affect the weight of the trigger pull.
If your pistol was purchased "new", the label on the handle of the box/carrying case should have a line that says something like "5.5 lb", which would indicate a normal 5.5 pound connector and no optional spring.
If the pistol was bought used, it may have had the spring and/or connector changed, so the info on the label may no longer be accurate. Then we have to get into identifying the different individual components, which is a bit more tricky.
Assuming your pistol has a normal spring and a 5.5 pound connector, the easiest thing to do would be to get a "-" (minus) connector installed, which should knock about a pound off the pull weight as well as make the pull seem less abrupt at the release point. If your pistol has an extra-power spring (NY1 or NY2) installed, I'd try a standard spring first, then try the "-" connector second. You should know that Glock Inc., does not endorse the use of the lighter connector for pistols used for personal defense.