Been told I "Look like a mom" ?

catsi • 19. pro-choice, pro-love.
When I was in high school a lot of guys would tell me "you have this mom vibe" or "you look like someone's mom" I even got "you'd make a really good mom one day" my best friends even tell me this. Now I get it from my boyfriend too. I just don't get what it is about me that makes me come off that way to people. I don't even know if I should take it as an insult.. it seems sweet to me. I just wish I knew what it is about me that make people say this.