I guess I don't know. I just have always known myself as a Christian. Not Catholic though. I honestly don't go to church very often. Pretty much a toss up i guess....
There are three main branches of Christianity. Catholicism, Prtoestantism, and Eastern Orthodox.
Catholicism is self explanatory.
Easter Orthodox you will find mostly in areas like Greece, Bulgaria, and Russia.
Protestantism imo is to wide a field to call yourself as there are hundreds of branches of protestant religions. Lutherans, Anglicans, Presbyterians, Baptists, 7th Day Adventists, Mormons, United. I could keep going but y'know there's a shit ton of them.