can your attorney desides not to handle your case if you do not want to settle

Normally the final decision on a settlement is up to  the client but the agreement with your lawyer may well provide that if he disagrees with your decision, he has the right to withdraw. Look at your retainer agreement, that should answer your question. Many lawyers reserve the right to withdraw in such a situation as they don't want to get in a spot where there is available a very good and fair settlement but a client for other than sound reasons (in their opinion) wants to battle onward.