Girl stuff (help)?

I need to talk about the "purse problem" Like when ur a sevie (7th grader) at middle school and you have you period stuff in there. Girls are like let me look in ur purse, let me look in ur purse. (anywhere they do this)If they saw my girl stuff they would be so immature. I have a friend who got her period last month and she is still immature i dont say that to her because she is my close friend. She makes a big production and has to let her friends know. Shes like i have to check something ooo i have to check something. Oww cramp, cramp i kno her and that bull! I never let them know and never did. Its not something to brag about gosh! And shes all like that. If she saw a tampon in my purse and she has her period think of how all my other immature friends would be. My main question is do any of u girls have the purse promblem talk about it to me and tell me tips. And also how to deal with a friend like this and if u r the same. Please answer thank you!