...I was born with this?

Does your favorite book smell like textured circles?  Do you think you are the same age as the cerulean blue, steadfast, brotherly, male number 4?  Do you dislike the personality of your bedroom’s doorframe?  Do you see white when you stub your toe?  Does the odor of road tar taste salty?  Does Sting's voice look like golden spheres?
If so, you are almost certainly a synesthete.  Synesthesia literally refers to the fact that in some animals, a stimulus in one sense modality involuntarily elicits a sensation/experience in another sense modality. 
www.mixsig.net/