Can I cancel the sell deed, as my mind has changed to not to sell my property?

Can I cancel the sell deed, as my mind has changed to not to sell my property? As previously I thought to sell my property and buy a new one but due to some circumstances I changed my mind to sell my property, now I don't want to sell my property but the buyer is forcing me to do the registration of the property on the buyer's name...I denied him for ample of time also sent a legal notice but as the property was rated for a lower amount then the original amount so that's why he is just forcing me to leave my property and get it registered on his name...he is threatening to harm me and my family and is trying to forcefully name my property on his name...this is so stress-full situation, please help me out as I want to protect my property and my family at any cost...please please please help me out... I'm worried for my property and family and I'm stressed as the buyer can do fraud and can name my property on his name without registration and without my consent...I really don't want to sell my property, I just came into the words of one of my friend but he also did fraud to me...he took my money which I had taken as an advance from the buyer after signing on selling deed...I trusted my friend but he is not giving the money back and since 5-6 months I'm asking him to give my money back but he isn't giving the money back, he is only giving excuses for not returning the money...now even when I don't have the money to pay back to the buyer for the cancellation of deed, I'm arranging money to give back the money to buyer but the buyer isn't taking the money back, he is just forcing me to sell the property to him...please help me, please...