Character Collide Problem

Breezeonhold

So I want my character (CH) to colide with a box easy right... However when my box tries to hit my character it hits the box that I exported my image from (photoshop). Is their a way just to get what I drew to collide with the box, or will I need to make smaller dimensions in photoshop and stretch my character from end to end? Picture example below if your kind of confused of what I'm explaining lol.

|Ch Here |<----- Box collides with invisible box.

I want it to collide with the character I drew.

Thanks as always.