If Shaytan has caused distress to you by making you feel that you are completely bad with no khair, and that you have no good thing left, then rest assured this is a pure waswasa. No human is completely evil or bad. You surely have done some very good deeds which Shaytan keeps making you forget and keeps bringing your bad deeds in your mind. It is very important to love oneself because that is the right of your mind. Give the mind its right. It’s important to take care of your mental peace and to have hope from Allah. Try your best to live a life of piety and in His obedience.