this is a problem for alot of people i think, but, and especially in the start its easy to get it going.
If you go out at night then try out some of the routines that you can find in both mysterys book, and on here. You'll usually get a good bit of conversation out of them, and if youve got the confidence you say you do there shouldnt be a problem.
Day game is slightly different, as routines that work at night dont always work during the day, because people arent out to socialise, theyre usually doing something. But if you have some good stories, either from experiences at night, or experiences from your ilfe then they can be good, especially if you open with something slightly related to the story.
If not then you can ask about the girl: "So what are you doing today then", and try and get a thread or hook from there.
If you get really stuck just comment about something the girl is wearing, or doing, so make a C+F (cocky funny) comment about her shoes, or her dress sense, not only will it convey confidence, it will also build attraction
Good luck mate