I really need some answers! why are my canine teeth yellow?

This is natural: Teeth are actually transparent, so light passes through them. Your canines are thicker than your central teeth, so light reflects more on them rather than passing through them. This makes your canines more opaque - you perceive this as more "yellow." also, your teeth all darken with age, so your canines will appear even more yellow. Bleaching can make this appear less dramatic.

Yellow canines: The eye teeth or canines have more color to them then the front teeth- they come in later and are formed later- you can alway whiten them if they concern you.