Well in my younger days i too did a spot of waitressing, and i was painfully shy, it was either do that or work in the local car factory, not a job treasured by many, so i opted for the waitressing job, it was brilliant, and did help me overcome my shyness somewhat, until i got sick of all the rugby player teams coming in and harassing all the young waitresses, today they would not get away with it, as it was our boss refused for us to serve them unless they calmed down.
Well good luck.