Ok so, I'm just over 12. It's almost impossible to feel exited. I almost never get sleep at night and I don't know why.I find myself thinking about death in some way(not suicide though) .I think I'm emo but I'm getting kinda worried now?

Have you talked to your parents about how you feel? I can just imagine how overwhelming these feelings may be for you to handle on your own. If not your parents another trusted adult. I would encourage you to do it as soon as possible. Prayer is also a big help as well as journaling, putting your thoughts on paper. Hope everything goes well for you