Since this is your first carry gun you will have to treat some things like the first scratch on a new car. Carry guns should get a bit ugly over time. Otherwise just leave them in the safe at home, just like you can just garage a new car and not take it anywhere.
If we could see a pic of the damage it may be possible to offer some solutions. If the rail still works, as far as being able to mount stuff, I wouldn't worry about it much. If it won't mount anything, you can do some light file or sandpaper work to smooth out any burrs. Since it is molded into the frame, there is no "replacement rail".
Do you actually mount anything to the rail? Usually if someone gets a subcompact, conceal ability is the first priority and adding stuff on a rail usually makes it harder to conceal.
Next question? How'd you drop it? May be time to look for a better holster.