How to control facial expressions

[Starboy]

Hey everyone I wanted to know how can I avoid having huge wide cheesy smiles when I smile or laugh. I have a difficult time controlling my facial expressions. On top of that I have dimples too which makes it even more unsexy,too friendlyish.My default expression is kinda resting bitchface/gloomy looking when I dont intend it to be. And sometimes I will think about something I find funny it doesnt even matter how old and I will break into a wide smile,but i'll try to hold it back and I will end up smirking instead and sometimes others will notice and ask me while im smiling/smirking and its kinda embarassing. I'm the type to smile hard when i'm uncomfortable/nervous.So how can I correct this and stop grinning like a child and be able to hold a mature neutral expression and not look innappropriate. Also when I want to make eye contact with random women to not smile so hard at them and instead bring out a sexy charming manly smile when I look at them.