Kudos to you for trying. I have struggled with debilitating shyness most of my life, so I understand what you are going thru.
Next time you have a date with someone new, why not suggest getting together for coffee instead? Not a full fledged date, but wading in a little slower. Might be less intimidating.
Also, keep in mind, it is not unusual to get nervous on a first date, whether you suffer from anxiety or not.
Good luck on your date!