White stuff😭

Ok so I masturbate frequently and I use my fingers. When I’m done I have white stuff all over my fingers. And I used to think oh it’s just cum.. but I just had a thought like it can’t be cum because cum has to like come out of me😭. I’m not like super dumb when it comes to masturbation and sex and stuff( I’m 15 , 16 soon) but I just want to know if it’s discharge or cum that’s on my fingers when I’m done😭