I think I may be depressed

I (14f) have recently been having problems falling asleep, eating, and just interacting with the world around me in general. I feel tired all the time and yet I do nothing all day. I feel extremely alone. I have no hobbies and no dreams. I have no plans for the future. I'm tired of life and I don't know how to get better/handle it. I'm scared to talk about it with my family even if they have already noticed I'm not well but never asked me or talked to me about it. I only talk to about three people that aren't my family and I feel like an outcast when I'm at school. I don't know what to do.