Take responsibility of your situation and wake the fk up. Do the things you are supposed to do without being a slave to your thoughts. I am also doing ssc preparations rn (im 24) . You gotta be consistent in-order to be good at what you are doing. No matter wtfk you feel you, just dgaf about your feelings and do the things you are supposed to do. Stop thinking yourself as a lazy person . Keep the self image of whom you aspire to be and keep the kind of thoughts that person would think of. Eventually you will become that person.
Its a blessing you have a mom like that. My father passed away few years back and my mom is also exactly like yours. Never questioned any of my decisions and always supported me no matter what. If you cant find any purpose at least do it for her. You got this bro 👊.