Many patients I come across worry how braces will affect their dating life (or married life!). There are options out there. Clear braces (milled out of ceramic) and Invisalign are two viable courses of treatment available if a patient qualifies. Some orthodontists now offer braces that go on the inside of your teeth. While much more expensive, these braces, generally called "lingual braces" are really the most invisible. It would be necessary to talk to an orthodontist about your concerns and what options they can provide.
On the other hand...what are you afraid of?! Braces will only make your smile better. A temporary inconvenience that will benefit you in the future. The demographic of the orthodontic patient is changing. More adults than before through all age ranges are getting braces and happy with their decision.
Here is an article, fairly humorous, regarding the subject.
http://orthodontics-today.com/2008/08/will-braces-affect-my-dating/