I am an interior designer with a certificate in AutoCAD. I was hired at an architecture firm about 6 months ago. I got this job because of my interior design degree. My boss hired me because he's wanting to expand his firm and offer interior design services to his clients. My whole interview consisted of talk about my position and what a designer could bring to this firm (I'm the only one here with any interior experience). He even gave me the title "Interior Design Liason".
So, now here I am, 6 months later and I haven't done a single thing involving interiors at all. I'm strictly a drafter (CAD Jockey). I know interiors are discussed in meetings, but these are meetings I'm not invited to. No one seems to have any idea when this firm will actually get involved in interiors. I'm totally the "low-man" on the totem pole because I'm the only one here who didn't go to school for architecture.
I hear people in the office discussing things that have to do with interiors (exterior light fixtures, flooring, counters). I even hear people dealing with problems that their having involving other design firms that are being used and such. I was actually told by one of the architects that she was told my sole responsibility is not interior design, it's to assist with drafting and helping the architects. I'm not sure how to involve myself in their projects because they're all under the impression that I'm a drafter.
I like the company that I work for. I really like my boss. I can see the potential for opportunities, I just don't think I can wait years for them to come around. I really dislike doing what I'm doing now. It's making me a very unhappy employee to come in every day and do what I'm doing. I love interior design and that's what I want to do.
How do I let me boss know all this without it coming off like an ultimatum? I don't want it to sound like he either involves me in interior design or I'm leaving (even though I'm starting to feel like that)? I just don't know what to do.

Any suggestions? I'd love some help. I'm feeling really lost and unhappy.