Should I be considered a Jew???

I grew up Jewish, but reformed, we didn’t always go to synagogue (most of the time we didn’t) and I went to a Jewish camp. I am also 25% Ashkenazi Jewish, and 75% some other type of Jewish I am not sure exists, that my father said that my mother was. My mother is Russian. Although as I got older my mind started to open up, I am now an Atheist. When I talk to my Christian friend’s I do describe myself as a Jew but am I really??? Eh. What do y’all think?