Bring it up in the interviews. You'll definitely get several interviews. A 19 on the DAT is average and even above average for some schools. Your GPA isn't bad, but isn't stellar. And it sounds like the rest of your material will make you look more attractive. Be confident! You will definitely be okay. The people on SDN tend to be way above average. I got a 19 as well and have gotten an interview at all the places I've applied so far.