Do you not believe you are worthy of support? Or, do you not believe that the Canadian military, who is engaged in operations on our behalf is worthy of support? Or do you not believe that the ideals that led you to join the military are not worthy of support?
I understand not wanting to look like "Hey, look at me, I'm a soldier, aren't I kewl", but at root, this is the reason we support our troops --because you are the enforcement arm of Canadian ideals, and when you support the troops, you support the reason they are put in harm's way in the first place. If I pick up the tab in a restaurant cuz I happen to see you in uniform, it's not because you and your co-workers are so kewl, it's because you are Canadian soldiers doing a hard job--for Canada, and for me.
Alternatively, you could always get a t-shirt like this: