Why do I bother?!

Trying to do my own nails that is. I stopped in at Sally's beauty supply store and bought some stuff to balance my own nails. I did the same thing that I was taught how to do last Wednesday when I got my nails done last. They were beginning to look a bit ugly so I thought I'd just fix them myself. Well I totally botched them. I thought they looked like @$$ before....They definately do now! Argh! Why do I do this to myself. I always screw up my nails. Even when I just paint them, I always do. Why is it so hard for me to do my own nails?