I want to kill myself even though my life is wonderful

Hello, Reddit! I'll briefly describe this issue to maintain anonymity. I recently found a great job where everyone is friendly and kind, and my boss praises and pampers me. I'm an excellent student. My family, my friends, and my girlfriend are the best in this world. I've never received so much love, care, and understanding. They always worry about me so much and still believe that I'm genuinely happy. It's a shame that's not true. I hate myself for blatantly lying to them. Recently, many people around me have noticed that I hardly eat anything, and to avoid upsetting them, I started pretending that I eat normally, sleep well, and am happy with everything. I know perfectly well who will say: "YOU'RE JUST POOR, MORON." And you'd be right. I'm sorry you're right. I plan to kill myself this month. This reality weighs heavily on me. I don't care. Finally, I'm being sincere, at least here. Thank you for your attention. Time for school in the morning. Glad all this will be over soon.