Agreed; it's not the sights.
Focus on the front sight, and work on trigger control. Squeeze the trigger slowly, and don't anticipate the gun going off. If the front sight leaves the bullseye, stop squeezing the trigger until the sights are aligned again, and then continue squeezing the trigger until the gun fires.
A Glock trigger can feel "spongy" until you get used to it, and it can cause you to not shoot well if you don't learn the trigger.
If you can't see the sights for some reason, then there's an issue there, but if you can see them, then it's not the sights.