I got the mechanics down in this game and I'm still practicing even until this day. Don't ever give up and persevere. I remembered getting this game for the first time and being awful with Noel. She was my main at first. Then I moved on to Hakumen. Then I finally had Nu as a main because at first I thought she was hard as hell to use. But I kept practicing and I learned stuff on my own with her.
Perseverance is your greatest weapon in this game. Don't ever let anyone tell you that you can't do this or that. Practice, practice, PRACTICE. No one becomes good overnight. I sure as hell didn't.
I also agree with being too focused on winning. That's what also messed me up in CT. I could have been more focused and patient with Nu in all the matches I lost if I had just stop focusing on winning and then getting pissed when I lost. CS has taught me that I should take every loss as a way to keep improving. When you lose, take the time to learn what you did wrong and try again. When you win, take that time to continue improving your style.