Bisexuality Support Group
Bisexuality is a sexual orientation which refers to the aesthetic, romantic, and/or sexual attraction of individuals to other individuals of both their own and the opposite gender or sex. Most bisexuals are not equally attracted to men and women, and may even shift between states of finding either sex exclusively attractive over the course of time.
I find it hard to approach women, too. I have to constantly remind myself that if we both step into the stereotypical female role, nothing will happen because the male is "supposed" to make the first move! Lucky for me, my current girlfriends weren't nearly so shy. :-)
I am also an introvert and quite shy. I dont think you have to "get over" it because its who you are. if its uncomfortable for you to approach people, then dont. I agree with going to the environment where someone may approach you...if you can. If that isnt an option (like for me where its a small town with no gay friendly places) or you are too uncomfortable, the explosion of online dating has helped those of us who are shy and are in small areas. Good luck!