I consider a YouTuber someone who consistently makes content for consumption via YouTube in the effort of entertaining or educating a fan base regardless of size or just casual viewers. When I had a few videos here and there on an old channel for video journalism-type things I shot in my town, I did not consider myself a YouTuber since it was supplemental to a website I was running at the time.
However, now since I am focused on entertaining via YouTube through music and comedy, I consider myself a YouTuber. I am at a point where I am waiting to have a project that I can be proud enough to justify referring to myself as a filmmaker, since I see "YouTuber" as being a kind of amateur term or stepping stone to that next level of sorts. Not to discredit filmmakers who are actual youtubers, I understand it can be simultaneous, but it is a different process overall than that of vlogging or making tutorials. As much as I'd like to, I don't count my music videos as filmmaking projects since I associate the term filmmaker with the cinematic process of pre-production writing, storyboarding, etc. and my music videos thus far have had no cinematic story line as they are mostly "let's just shoot me playing this over here and then singing over there."