I know how you feel, too! I have lost about 33 pounds now, and I could hardly tell at all. I've definitely lost inches, and my clothes fit much looser now, but just by LOOKING at myself, I couldn't see the difference.
BUT...
Today was my first day back in my aerobics class after one whole week off for Spring Break. So, the last time I saw myself in that mirror was over a week ago. Today, I actually DID notice. I actually thought..."hmmm. that isn't so bad, after all..." of course I still have a very long way to go, but I'm getting closer to how I want to look, anyway.
Keep it up! You're always harder on yourself than anyone else, and it's really difficult to see the small changes happenning in your body when you see your own body every day. If other people are noticing, then it's working, even if you don't see it yourself!