Help?! Opinion needed

OKAY..so I am generally an very confident person. I’ve always been kinda big. My boyfriend and I are pretty serious and what not. He’s a firefighter. He’s also someone who used to be pretty big himself then lost a lot of weight. He’s pretty fit.. is it like normal to feel like I have to lose weight to..idk, keep up with him? He loves me for me and says I’m beautiful the way I am. I just know people give us weird looks when we go out.. this is me so