How to approach a pretty lady in a public place?

So here's the deal; mentally I am confident in my own skin as I am aware that I am an attractive young man and possess countless qualities deemed favorable to woman. Many of my friends that are woman commonly refer to me as "husband material." When I'm walking in public places such as the mall or my college campus I frequently become aware of beautiful woman display interest, sometimes I can hear girls whisper to their friends about me, yet I still become enthralled with a nervous sensation and will many times say to myself "okay I got this" but then effectively divert my way out of what could of potentially been the encounter with my soul mate. Once I've gotten passed the primary conversation I begin to break out of my shell BUT my problem is my approach, body of dialog, and exit which may or may not be a mere feature of a more complex mental issue or simply a fear of rejection.I'm a very passionate lover, an ideal friend, and considerate person however attain this fear that I would hope to over come someday soon before its too late and I find myself an old man reminiscing about the what if's... Ladies any suggestions you could articulate that could assist me addressing my situation would be much appreciated!