and don't stop. I just read your comment of 11 years ago as regards what your exgirlfriend said to you. anyone can sing if they practice. anyone good can become better. it's an ability learned, not born with, combined with feeling. if you can feel it, you can learn it. unless you have permanent damage or something like cancer.
I'm learning right now with (DON'T laugh, it's a very professionally compiled learning experience) Singing For Dummies. I recommend it, from a guy who used to scare and humor people with my (un)ability to sing to a guy who impresses people with it.