Consider yourself lucky to have the problem. Many here are dating their FleshLights
Be honest and date your mom or dad if you can. If that doesn't work out, stay home or go for the one that will make you the happiest? Can't figure that out, go with the one that will spend the most on you.
The best you can do for all involved is be honest about the fact you haven't settled down to one person right now. Be gentle on how you put it of course.
Been with the same girl for a ton of years now. So the most important thing is not to forget the day! The restaurants and bars will be crowed anyway.