After working for five years, you will gain more or less in the workplace for five years, and you will not get nothing. Therefore, you don't have to sell yourself short. Seeing this problem, I personally think that it is useless to describe it. It may be because you are demanding of yourself. On the one hand, you failed to achieve your previous expected goals for five years, on the other hand, you added new expectations but failed to achieve them, and so on. These may be the reasons why you feel that you have accomplished nothing, so I suggest you clarify your true thoughts. To say the least, suppose you have understood why you are dissatisfied with your grades and found out the reason is that you didn't study hard before, then you should study hard from today and know why, and then you will know what to learn and how to learn. You must combine your own practical experience, job requirements, personal needs and other targeted learning to make key breakthroughs. Life will not be unkind to those who work hard.