I am too shy and get nervous easily.please help me with being confident talking with girls?

i have a huge lot of guy friends and they know i am a very good
friend.
but when it comes to talking with someone from opposite sex,i get all
nervous and begin blushing.
-i am quite outgoing but i haven't asked any girl out so far(forget
asking out when i just can't communicate without shivering !! )

can anyone give me some tips to get over this strange fear ?

thanks :)