Sorry to hear this Prodigy Angel.
Quite a few gifted teens get something called existential depression. You might want to look it up and see if it fits with you. If it does, get any help you need. It isn't a fun place to be. (Does anyone know a good link for this - I could only find stuff for parents? If no-one finds anything better I'll post that.)
Another alternative is that you are 'just' bored. I say 'just' because it can be a real problem when you are that bored. When I was a teenager, I found outside challenges were what kept me going. I actually did better at school when I was living on the border of having too much to do. Some of my challenges were trying to learn to write in Egyptian hiroglyphs, teaching myself some computer programming and trying to reform drop-kick boyfriends. I wouldn't recommend the last one, it's a waste of time
Wishing you all the best,
GeoMamma
