Good advice above. I've been carrying Glocks on and off the job since 1989...with nary an issue.
If you are so inclined, a useful "gadget" to make your gun safer while holstering can be found here:
Striker Control Device
– Tau Development Group
(I have them on my four Glocks, but only over the past three years, so obviously familiarity and discipline are most important. That said, things happen when Mr. Murphy comes to visit and I am happy to have purchased these for my guns. I have no affiliation with the company, nor any financial interest.)
ETA: The installation of the striker control device is easy and straightforward, takes literally only seconds.
You can find info about the device and how to install here:
https://www.youtube.com/results?sear...triker+control