Open Question: girls- what would happen if i will start shaving my armpits at age 14?

i already have armpit hair, its already starting to get visible but only on my right pit, its not visible yet on my left side i dunno why. and i really want to shave but my mom said i cant because if i shave the hair will thicken and my pits will be darker, is that true? what should i do?!?!