Sometimes When I Penetrate My Vagina I See White Stuff

Dear Dr.Betty ,
I am 16 years old and started masturbating when I was around 12 years old. I still haven't had sex but I do penetrate my self with a small bottle of cream (that's empty) when I masturbate, and I've noticed recently that every time I finish, when I take out the bottle it has white stuff on the end, some times its clearish then others its like straight up white; that sort of looks like cum. it doesn't happen every single time I masturbate but it happens frequently; could it be uti or vaginal infection ???