I think something is really really wrong with my gaydar...well...it is simply non existent. Actually this is starting to become pretty anoying because I keep falling for the wrong girl eeevery time. How do you guys do it??
Lots of trial and error. Your gadar will get stronger in the sense that you will be more able to choose women who are attracted to women. The quality of those women will depend on your ability to pick good friends. If you have good friends, then you know what qualities you want in a partner. It's a good place to start.