The handle is too fat. My hands don't grip it well because it is so fat. The length is fine.
There are a number of handguns that will fit your hands better than the Ruger. If a large capacity 9mm is the goal then the best fit where one has excess of 10 round capacity is likely to come from the either a Browning Hi-Power or CZ-75 (clone) Among the many handguns that fit this desciption are the old BTA-90 from Excam, the Baby Eagle (this is an Israeli made gun that has the same profile), the EAA witness, and several pieces from Charles Daily. There are single stack magazine 9mm's made including the P38 by Walther tat fire the same cartidge but do not have the large capacity magazine. This might be a consideration.
You might also wish to consider a .40 S&W or .45acp single stack handgun. Consider that in a combat situation the 16 round capacity of that 9mm is very seldom needed unless one is a LEO or in the military. The reason for having a large magazine capacity is to allow for a whole lot of misses or the need for multiple hits on the target.
Clearly without seeing how your grip is on the firearm no one can absolutely recommend any firearm but by looking at a number of options you will be able to come to a good decision.
Stay well - Stay safe - Stay armed - Yorktown
Get a Kahr 9mm. Nice single stack mag.