It's unfair, but women are judged by looks first and everything else second. So guys may be attracted to your appearance, but soon discover that they don't like something else about you. It doesn't necessarily mean that you have a bad personality. Maybe there is just a significant difference between who you are and how you present yourself. For example, if you are a very serious and intellectual person, but like to bleach your hair platinum blonde and wear miniskirts, you might be attracting the wrong kind of guys.
Good decisions come from experience. Experience comes from bad decisions.