Only here to make him happy

So my MIL since i met her three years ago comes across like my only worth is having grand babies and making her son happy. Idk how my mom feels about my boyfriend but is this weird. Like anytime we have a conversation that is more than chit chat she goes on and on about how happy i make her son. Like today she gave me a Valentine's day card that said you make my son happy :) happy v day. I feel like I'm not even a person to her. Like I'm just here to make her son happy and that's it. Am i crazy? I can see her side kinda about wanting her son to br happy but still....