This is Uncle Johnnie talking to you. It was sad to hear that you got a drop for the year in the engineering studies. Nevertheless, it is the orientation which you acquire from here which will set the course of your life. There is no need to make you aware of the names of the personalities which made it big after getting the setbacks, since you know them already. The first thing which you should learn from these people is that none of them were proud of the early failure they received.
The attitude which they showcased was positive and the intent was to never face any such consequence later in life. I recommend that along with learning the subjects backlogged, try your hand at some small time employment opportunities. This will build confidence; but remember that earning is still a subsided option for confidence. The main focus is the studies.