Must a fashion designer be good in drawing, or good in mixing colours, or both?

hi im 13, and my dream is to become a fashion designer(after being inspired by watching america's next top model), thats why im gonna enroll in the lasalle international university(a special university which has a diploma for fashion design) after i graduate from high school(but im not a very good drawer, but im good in mixing colours), should i be be good in drawing, or good in mixing colours, or both? and what should i do if im not good in drawing?
LaSalle international university in montreal, (search in wikipedia if u dunno) :)
 
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