Why must it be so Hard?!?! 😒

UPDATE: I stated bf/SO because since we're not married, technically he's my bf, but being in our mid/late thirties I absolutely HATE that title and SO is somewhat better 🙄 Would I rather be called his wife? Absolutely, but I'm not one of those women who refers to herself that way if it isn't actually legally true. I was just bothered by how she looked/acted when introducing me. I've had other friends of ours refer to me as his babies mama which is even worse 😡I know it sounds stupid and juvenile, but it's an issue I've been trying to deal with for years and was hoping for someone who could possibly relate and have a suggestion.... ORIGINAL POST: My bf/SO and I went to the first birthday of a friends son (She was His friend first...they were together a looong time ago and have some history and she's remained super close to his mother). Anyhow, when we arrived, upon her introducing me to ger dad since I've only met her mother when I took her son's newborn photos, she stated, "This is *Sarah, Josh's partner, practically wife" ...blah blah blah. I found her intro odd as she seemed to struggle and almost at a loss to the point of irritation of what to call me as he and I have been together for 6 years as of April 2nd, have two boys together but aren't married (he's not big on the idea 😑). Needless to say, it was an awkward moment, and I hate that it's difficult for people to meet me as we're living as married but actually aren't wed, so they don't know what to say. I HATE being so bothered by moments like this. I don't know if she has some sort of resentment towards me even though she's never shown it, or if the relationship I have with him is THAT confusing to everyone that they don't know what to say. I already have to live with the irritation that I'm a gf and not a wife...what can I say to make interactions somewhat easier??