You guess you have to go through with it now?
Hell no you don't HAVE to. It's your's. It belongs to you, it's your property. Until a buyer is putting currency in your hand and loading the pin in their vehicle it's still YOURS.
If you don't want to sell it, don't.
Just because you've got some people interested in it doesn't mean you HAVE to sell it if you've rediscovered your passion for it, which it's apparent you have.
I respect your more for keeping a pin if you found out you really don't want to let it go.