If you read enough of these posts, you find that a lot of newer nurses are struggling, and all too often their performance issues are blatantly pointed out by fellow workers, making the nurses feel insecure and miserable. You do not indicate that anyone has said anything thus far. So I would be inclined to think that you are harder on yourself, than anyone else is. New nurses generally have a hard time their first year of nursing, so you still have a ways to go. And, these days, even with the best time management skills in the world, nursing can be a struggle.
If you have a really good nurse manager, it may be helpful to talk about it; on the other hand, you may call attention to yourself for no good reason. I would suggest going to the nurses who you admire and think are especially good at what they do, and ask if they have any suggestions on how you can improve your performance. I woudn't go around telling anyone about all the "mistakes" you are making, again, that may just bring negative attention. Good luck!