I dont know what to do. i dont have any motivation to better myself and i cant get myself motivated. i lack fo?

i dont know what to do. i dont have any motivation to better myself and i cant get myself motivated. i lack focus so much that i had to drop my class. in the past i have tried to be better but i just dont have any mental strength. i am scared the fact that i am wasting my 20's away. what should i do?