Every day—morning and night, while brushing your teeth—look into your eyes and talk to yourself as if you are a loving parent. Compliment yourself. Say out loud things like: "I am proud of you." "You are beautiful." "I love you." "You are so strong." "You are doing your best."
Even if it feels silly or like a lie…say it. Keep doing it until you believe it. Nothing about you or your weight has to change to love yourself. That is the place to start.