Trust me... someone somewhere not only knows that you exist, they're wishing that you would notice THEM. Just get outside yourself, do things you enjoy, volunteer, whatever. The rest will follow. You simply need to start living life as it was meant to be lived... helping others, practicing random acts of kindness, and being a person people want to be around.
Most of the quiet ones are usually very smart. If you want to be known, you could always try to become an author. You might be a very good book writer. Maybe you're a good singer. Try things that interest you. If you don't care to be noticed, then you can always just stay as you are.
So you're gonna want to make an effort to be noticed. Not in an embarrassing way but if you're a shy natured person, you need to step out of you box and be noticed. Whether that be by talking more, doing some sport at school or just being more confident. Remember, I know it seems like people care about what you do, but they really don't. Not in a bad way they don't care, but if you say or do something really stupid or embarrassing, sure they might laugh. But they actually don't care. Their just laughing cuz they don't know what to do. Hope this helps