Hi Hani,
Is there someone at your school you can talk to, like a guidance counselor or school psychologist? A teacher you trust? I really don't know the systems in Indonesia, but it sounds like you need some help. Try doing the Beck Depression Inventory (it might even be available in your native language, since it's a popular test). It's far from perfect, but it gives you a score for the severity of depression, and asks about things like your appetite, ability to do tasks, self blame, feelings of failure, self criticism, etc. It might help if you can go to your mom with something quantitative (solid numbers) to show her how you're feeling.
You can try to set goals for yourself, however small, so that you have something to work towards. For now they can be things like "go to school", "do homework", "limit playing on smart phone to ___ min (or don't play on smart phone)", "do at least one household chore", etc. Even if the goal seems tiny, if you make it reasonable, then it's something you can work towards to help accomplish more. Make sure you're eating right, try to exercise, and try to get plenty of daylight, which can help with mood. Again, the exercise goal could be to walk around the block, or do 5 pushups, or any other small task. Anything is better than nothing.
You are not alone. You should try focusing more on the positive things in life. Start by making a list of the things you are grateful for. Love yourself. You are worth it.