I'm 19 yrs old and I don't have any facial hair. My moustache hair is so tiny & unshiny & unnoticeable. Any suggestions?

I want to use minoxidle for my facial hair and I know it'll make my moustache hair thicker but i cannot use it for my whole life so, if I discontinue it , will it make my moustache hair (which will become thicker after I use minoxidle) become tiny, like i had it before......if not how can a thick hair shrink (I.e, become softer and tiny).....