You can change your mind. If you said “yes,” you could now say “no.” If you always have…, you can choose to not… anymore. You made the purchase, signed the line, shook the hand. You can return the item, sign another line, and consider another option. Did you get dressed and promise you were coming? You can get undressed and assure them you meant no wrong.
We make decisions based on the information we have at that moment. When new information presents itself, it is wise, mature, and allowed to make a different decision. Emotions change. Desires change. Access to resources change. People change. So can your mind.
This does not mean you are fickle, disloyal, undependable, or unkind. It shows you are mindful and self-aware. Just as you hear their needs, desires, and offers, you hear your own. To change your mind is to courageously listen and respond accordingly, not only to them, but to yourself as well.