Trust stepdad with puberty questions?

so I love with my stepdad, and his two sons who are twins and we are all in the same grade... all my friends talk about how they went bra shopping with their moms or got stuff for their periods with their mom. I want to have those experiences but my sources are limited. Should I ask my stepdad to give me "a talk?" And take me bra shopping? He's totally nice, it's just I'm scared my brothers will tell everyone I need a bra and got my period, especially since there friends with boys and my crush in our grade... help?
Trust stepdad with puberty questions?
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