I had that problem for a while. I guess for some people it’s easy (they fly in their first LD), while for others it takes more practice. I fly by using some device to help me out at first (jetpack, hang glider, etc) and then I don’t need it once I’m flying.
I would recommend the Different Styles of Flying thread, and tosxyChor’s Dream Control Training Course for more information and suggestions. Remember that it’s your LD and you can do what you want! Good Luck! 