How to keep calm cool and collected around attractive girls?

How can I stop sweating pretty girls and putting them on pedestals when I suck around girls and never had a relationship or anything of that sort. Also they never really talked to me unless I have gone out of my way. A lot of the things that I do tend to be corny and crazy, while I am quiet not much of the leader type and more laid back. I am not really the take charge type of person unless really pushed into the position. Even then I feel very nervous and not sure of what I am doing. Just even planning a date I never know what to do or where to go even though I have had a few dates.
How to keep calm cool and collected around attractive girls?
Post Opinion