It's pretentious to call yourself an artist if you are the only person who thinks what you make is art.
No.. whether you're a
good artist then becomes the question

Any creative endeavour with the intention of doing more that methodically following a process can be describes as art. Anything that is created just to please, or provoke thought... could be described as art. It may be rubbish art in some cases.. but still art.
Plus.. it depends where you are and who's opinion you're talking about.
Making pictures certainly doesn't mean you are an artist.
Not if your intent is merely to accurately record the scene before you, no. If what you produce causes people to re-evaluate what they thought they knew about a subject in some way, then it transcends mere picture taking. Many photographers can, and do that on a regular basis.
Photography, especially amateur and commercial photography is the only art form I know of where calling someone an artist is regarded as pretentious. I reckon it's because it's one of the few art forms where you can still create passable results (on a technical level) without any creativity whatsoever, and therefore removing "art" from the equation gives a fighting chance to those who are not creative. When someone comes along and suggests it's art, then that threatens such people because then there's a chance that their work could be appraised as artwork and creative content and not just on technical merit alone. That threatens some people.
Hence, I am neither artist nor photographer but someone who uses a camera to make pictures.
Not very ambitious, but fair enough. It doesn't mean that those who do create art, or regarded as creating artwork are pretentious though. And since when should we be deciding our worth based on what others think? Personally, I couldn't give a stuff what others think of my work. I create it for me, and because I need to do it. I'd carry on with as much enthusiasm even if everyone hated it... which actually, they often do.
Sometimes I produce art, sometimes I produce photographs. There wasn't a "both" option to tick.