good to see you are talking about it, that means you are seriously considering to drop the wedding plans.
you are 23, only had one boyfriend, there is lots more to live.
I too only had and still do have one girlfriend, and i never been with other girls. That has been a continuos choosing, and not an ideal to fit into.
Don't settle for vanilla without having a spoonful of other flavors.
Also, to marry often leads to conceive babies and then you are i the jam. Leave that tedious stuff for when you are 40, is my advise