I understand where you are coming from. I've had my machine for over five years and am doing just ok. People have told me to practice, practice, and practice but I keep practicing the wrong way and have done so for years. I won't quilt for anyone else because I have never gotten better. Finally, this Saturday I found someone who will give longarm lessons on her machine at her house and I can't wait! So don't give up, there are sources out there.
youtube has some great ideas as well