How to dispose/use diapers well living with parents

I live with just my mum and brother. I’m 18 and finishing my last year of high school well my brother goes to uni and mum works, I’m home alone for hours fairly often and I could easily get the order but I don’t know how to dispose of the diapers. I can’t just tell my mum as for me it’s a rather sexual thing and I also can’t just throw them away as I plan to mess them. Any suggestions?