Just keep on grinding it out. If you have the focus, motivation, and time, you will succeed.
As for others not liking what they are making, I think it's just part of the process of improving and being able to self-critique. We have to be able to objectively look at what we have made and judge it with an eye towards improvement, then grow from there. I think people get stuck at that last part because they identify with their art and have a hard time distancing themselves enough to get that objectivity without disowning their creations. I admit to struggling with being too attached sometimes, especially when I have spent hours working on something.
EDIT: I should have started with "These are good exercises. It is evident that you are learning from these. Keep it up!"