If you're experiencing persistent sadness, hopelessness, loss of interest in activities, changes in sleep or appetite, or thoughts of self-harm, you might be dealing with depression. This is a serious medical condition, not a character flaw or something you can just 'snap out of.' Talk to a parent, school counselor, teacher, or other trusted adult immediately. Depression is very treatable with therapy, medication, or both. Don't try to handle this alone.
If you're having thoughts of suicide, call 988 (Suicide & Crisis Lifeline) or go to your nearest emergency room. Your life has value, and help is available.