CrazCruz - you didn’t necessarily use the wrong words - I’ll disagree with Yo just a tad bit here to let you know that some MEs do in fact design things, but its the ID person who partners with him on any particular project whose responsibility it is to make sure that any design work the mechanical engineer has developed fits with the sensitivities of the ID discipline (brand, color scheme, user interface, form, tactile/audible/visual feedback, etc). Similar to what Yo advised, I always describe the ID function as one that sits directly between engineers and marketers to bring all the develop parts together on behalf of the user - a well balanced industrial design function then also plays equally important roles at both the front end (research) and back end (manufacturing) of any product’s development.
You can be a successful ME who contributes to the ID function just as efficiently as you can be a successful ID person who contributes to the engineering function. 