There are so many important traits that a designer should have, but i think drawing skills is just one of the lesser traits these days(unless your job deals primarily with hand drawn products). It's good to have this skill, but you wont die without it. Those who are good at drawing can impress clients by drawing impromptu images to convey your ideas during presentation. Those who are not good at drawing, well... we will just need a workaround solution either by pre-selecting pictures from the internet or any other creative solutions. In the end of the day, as long as you can bring across your ideas to your clients, that's a win.

To me, a designer's most important trait is to have a sharp mind with the ability to understand your client's needs, while being flexible enuf to reach a consensus by delivering the artwork without compromising a good design. I've seen designers with mad design skills but they are very rigid and unyielding in their design to suit their clients needs. They behave more like an artist that create personal artwork for themselves to admire more that a designer who create an artwork to suit their their clients. In the end, they will frustrate the clients, then frustrate themselves for losing their clients.

Anyway, do what you can so you wont fail the subject, but there's no need to beat urself up just because u r not good at drawing. A designer is a jack-of-all-traits and master of some. Just make sure u r really good at that something else and you will be fine.