Is life really worth it?

I'm flirting with the idea of suicide and I don't really know what to do. I don't really have that horrid of a life but I'm just sad all the time. When I'm by myself or with friends and family thoughts of suicide creep into my mind and stay there for hours until I make myself realize I should be doing something productive. Life just doesn't seem meaningful anymore, I wake up do stuff try and look happy for my friends. It's sad because I want to tell them that I'm sad and hurt but I just get the feeling they won't care and think I'm complaining. This I know isn't true yet I can't bring myself to talk about it anyone I actually know. I feel like I'm loosing the thing that I used to be great at, actually I know I'm loosing the thing I was great at. I used to believe I could write an essay on any topic and make it sound fascinating and this year I'm failing english. With everyday I'm becoming more and more of a failure and I feel as if I have nothing to look forward to. Ive imagined my future and it's looking so bleak. For a while I thought I could become an english teacher but I'm much to idiotic to do something that meaningful. Melancholy has been a huge part of my life for as long as I can remember. When I was little I hated myself and I continued with that up until I was 14. I was rather happy up until now, I'm 16 and feel completely worthless. I will never be good enough for society, my parents, my friends, and myself.