Should i sell my wedding dress?

If you didn't get married in the dress it has no sentimental value. If you decide you are never going to wear it for a future wedding there is no point in keeping it around, taking up space. Talk to your great grandma. Tell her you don't want to keep the gown anymore for the reasons stated above.There is no reason to feel bad. I am sure she would understand your reasoning. Ask her advice. Tell her you will sell it for her and give her the money. I am sure she wants nothing more than to see you happy and will understand.