How can I tell my older brother I got my period?

I live with my older brother who's 19 and I'm 13. I just got my first period and I'm really embarrassed and don't want to tell him but I know I have to. Do you think he'll make fun of me? Any advice on how to approach the subject?
Updates
+1 y
Both of my parents died in a car crash when I was little so he's my legal guardian
How can I tell my older brother I got my period?
Post Opinion