That mic should be just fine for what you're doing.
As
@dvs said, it's about mic position.
Try to aim the front of the mic towards the guitar in such a way that more of the top and or sides of the mic are aimed at your mouth for maximum rejection.
I would also say, if the mic is set back, you're more likely to pick up things other than the guitar.
Try bringing the mic closer to the guitar.
The net effect of that will be........ you can get good recording level with less gain (because the source is closer).
Consequently turning down the gain on the interface will reduce the volume of sounds farther away from the mic ( your breathing, room noise and such).
Of course you can help reduce room noise by using a super cardioid.
I have only one of those and it's rather pricey so, I can't recommend any reasonably priced ones, just do your homework.
If you're looking to experiment with alternate mics for your acoustic guitar recordings, I'd say look into picking up a small diaphragm condenser or a matched pair of those.
They work great for acoustic guitars and can be a great supplement to the mic you already have.
Most of my acoustic recording are done with two mics , a super cardioid ribbon and a small diaphragm condenser.
A two mic set up gets a little more complicated (making sure that the mics are in phase) but, that technique can deliver wonderfully rich tones, and will open up additional possibilities in mixing the tracks.
There are some reasonably priced small diaphragms out there do so do a little searching.
I forget where you live but here's an example of SDC mics.:
https://www.sweetwater.com/c105--Small-diaphragm_Condenser_Microphones