Should I tell my girlfriend (20F) about my (M24) fetish?

Hi so basically I've been debating about telling my GF about my sort of cuck fetish? So I'd love to talk to her about my how I like interracial porn and interracial cuckolding, and some things with small penis humiliation. (I'm 4 inches erect). We've been dating for half a year now and I'm worried maybe its too soon or if its a bad idea just in general? I just want to be open with her and explain the things I like. I don't want to ruin this relationship either so I feel kind of stuck right now and unsure what to do about it.