I have always been afraid of asking my mom for pads and now i know why (read please )?

So my mom and I went to walmart today and i have always been afraid of asking her for pads because of her indenial of me having my period which she saw. So i asked and s he is like why? i said for my period. shr sais when? i said soon. Then we changed the subject as some guys ped by. Right now i steal pads from my sister annd take a few from my g`ma, ( she urines involuntary occasionally ). What can i do about my mom?