Help a friend, please.

How can I help a friend who won't buy nor pack their own lunch? I've been feeding my friend my own school lunch instead because I don't want her to be hungry but if course, that took the cause of my own needs. Everyday, I'd binge eat after school because I skipped lunch. I really wanna tell her that I can't keep sharing my lunch anymore but I'm scared she'll call me "greedy" or "fat" for wanting to eat. I know she'll never say that, she's my friend. It's just an experience I'd go through at home. I'm also worried about her going hungry too because I know how it feels. Her parents won't get scholarship for school lunch and she's not willing to eat rice/sushi from home. She would eat her lunch before lunch too. I don't know what to do, I'm sorry. It's all my fault that I'm making myself starve but I can't help but feel bad. Being "kind" is just the worse thing yk? Well idk what to describe myself in this situation, I don't know any other words sorry. But yeah, it gotten so bad that I feel so hungry everytime I see food mentioned or so. My other friend had salmon on her screen, from the native tribes website. I said "I'm soooo hungry" she question if I ate today. I didn't eat much, I only ate khao tom but it didn't fill me up at all. After all, Khao tom is like a dessert rather than an actual meal (the one I had at least)  she said I should talk to her but again, I was worried about being "greedy" and "selfish". I wanna be mad at her for not packing her own stuff or at least saving her lunch for lunchtime but, it's not her fault. Sorry for ranting, I know this is a lot but I really want some help, support or yeah. I don't know what to do, I wanna cry.  It's just food, yeah but I'm so sick of ramen everyday after school. It's hard to talk to my mom about getting food too because she doesn't know anything about this, she'll call me fat. Again, my apologies for ranting about my personal problem that I should be realizing with myself or just keeping it in.