Ouch!! 43 bite!!

I'm pretty new to Glock, but have learned to admire the simple effective design, and most of all the reliability. Bought a G43 Gen4. Right off the bat shoots like a dream. However, the bottom of the trigger guard is hitting my middle finger to the point of semi-serious pain! I regularly shoot my other brands, HK, Sig, S&W, Kimber and have no such problem. Is there any solution to this--I'd hate to lose the ability to use this otherwise significantly superior firearm.
Thanks in advance