I need some advice...?

Hi Ellie: you sound like you're young -- a teen or young adult -- so I hope you'll believe people if they tell you that such feelings are perfectly normal at your age. We've all experienced them. There are so many physical and emotional changes going on in your body that you can think you've got every mental illness in the book. Try just being a friend to others who might feel lonely. It will help you develop while bringing happiness into others' lives. And if you ever feel completely at the end of your rope, reach out to a doctor, a counselor, or clergy member you trust.