Ok so...I am on my period,I need tampons..and im cramping really bad..and im a wuss...and stupid?

I'm 13 and I need tampons.I'm soo stupid because I've always been scared that if I tell people personal stuff like that they'll quit loving me....(I know Its completely stupid..) My mom has always usually just bought me stuff but...Im out..and she won't be home until tomorrow morning,I have no money and they only other person here is my older bro (hes 23 he still lives with us cuz hes a dropout long story....)So...yeah..idk what to do.Also do they make midol for teens?? I dont know what ever convinced me if I told people I care about personal stuff like that they'd stop loving me...but im stupid cuz I even thought that about my mom.I have no other family members close.... :( Help? and how to ask my bro?