Even when you are good enough to fight a good trainer will always find things you can improve so i wouldn't feel too down about his comments RE your footwork. I sounds negative but you now know what to do for your next step - improve your footwork. Check out Scraps post on fast feet and I'm sure there's tonnes of other posts on footwork etc you can read for some good ideas.

Prove to your trainer that you have heart by not training and you will eventually get your first fight. In my gym no one fights on less than a year's training because my coaches prefer us to be overcooked rather than undercooked for our first bouts. It does dramatically increase your chances of success at least initially so at least when you do have your first fight you can use that thought as a confidence booster.