Im 12 and i feel depressed and lonely but no one died! i don't know what to do?

Write a letter to your mother. Writing is better than talking because you can revise it until you've said EXACTLY what you want to say and you will get it ALL said because she won't be there to interrupt. Tell her that you're hurting, upset and depressed. There is no one that will ever love you more selflessly than your mother. Maybe she's tired from working and doesn't "look very closely" at you and your brother/sister because she is hoping that if she doesn't know about problems that there aren't any. Tell her and ask her to help. I'm sending (email) you something that has never failed me or my family in times of trouble.