Can’t help w my insecurity

I’m in a 1.5-year relationship with my girlfriend, and lately, I haven’t been feeling good about it. She’s amazing, very kind, beautiful(literal goddess), and way wayyy out of my league due to which makes me feel incredibly insecure whenever we’re out in public (like in the metro or a cafe). People stare, and when they do, I feel awful and kinda scared. I can’t help but think I don’t deserve her. It’s not her fault, it’s mine for being so insecure. I know she loves me and chose me, but I just can’t ignore people and joh bhi wo bolte hai. I’ve tried ignoring it, but nahi ho paata ignore, dimaag me bass jaata hai sabkuch I just hate myself when i overhear random people making comments like, “Isko kaise milgyi ye” or “Acchi Fasal ko humesha keede kha jaate hai” Hearing things like this breaks me inside like tf did i even do, why do people hate me? Just because of my looks? I can’t bring myself to break up with her because she has such a soft heart, and I know it would crush her. Tbh I don’t want to live like this anymore, It just sucks i can’t help it and i can’t handle it anymore tbh, I have no one else in my life except her and one other friend. sorry for the rant, bas kahi likhna tha.