Masturbation

I think my older cousin found out I masturbate (I mean who doesn't) but I didn't want him to find out (also I'm a girl) but he crawled up on my bunk bed where I left my "stuff" which is laying right next to my charger which I'm sure he used and now I'm pretty sure he knows. I never worry about hiding it because you don't know it's there till you climb up here I don't ever have people up here but apparently he climbed up into my bed without me knowing! I really would like for my parents to not know I masturbate I mean it's natural yes but I don't feel comfortable telling them I do I mean what's the difference if I tell them or not I just don't want them to find out really I feel anxious that an older family member knows I masturbate :/