To overcome shyness, you have to push yourself to be more outgoing. This will make you more sociable in time and also provide you with tales to tell. The next step is to try practice talking to girls you are most comfortable with at first and gain more confidence. For more details, visit http://www.wikihow.com/Overcome-Shyness-with-Girls.
do what i do just walk right up to them and start talking say like if there alone and you think there pretty look around see if there is a guy with them if no walk up and say something like what is a preety girl like you doing all alone or somtin nice and boom or if it backfires be like okay i know that was dumb but hey ...
You have the same problem as me ! .. But keep in mind that u just have to be funny and that they don't have to like u , be yourself because there has got to be a perfect one out there for you! The only tips I have for u is to be a a talkative person try not having awkward silence moments , and hang out with them a lot but take a guy friend with u , umm and just try being calm and happy!
You don't need to overcome it lots of girls like guys who are shy! But if you really want to overcome it then you can ask one of your guy friends to ask for her number for you then start textig her and eventually talking on the phone once you have gotten to know her enough it will be a piece of cake talking to her!