Here also the responsible and concerning moment came in your life - you decided to open for the beloved the feelings. If you never made a declaration of love to the girl, experience in love affairs have insufficiently, you should not be discouraged.
1. Your relations with the girl just about will move to qualitatively new level. For this purpose it is necessary to make a declaration of love to her. For a start think over the scenario of your recognition, the atmosphere in which it will do to you comfortably. For example, tell the girl treasured words on the date of her birth. It is for a long time remembered. You can pick up the necessary day and the necessary time. And by all means you have to take care of the necessary situation. Let it will be walk in the evening and deserted park, for example. Such intimate atmosphere helps both of you to concentrate attention the friend on the friend more on anybody.
2. Here, for example, you walk near the moon. You hold hands, speak to it about something fine, perhaps, even read verses by the famous or not really famous authors (certainly, about love). Suddenly she is distracted by what that bright, for example, on a salute nearby. And you begin to act at this time: you take clean glasses and a bottle of wine from your backpack which so imperceptibly hung on a back, pay to yourself its attention and say the recognition, looking it in eyes. Then you immediately fill glasses and suggest to drink. Such recognition for certain will make the girl conceited (in good sense).
3. If you are not absolutely sure of the forces, beat a scene with the close girlfriend on roles. It as the woman, will help you in word and deed.
4. Also you remember that recognition in pure feelings is serious and very responsible step. You swear fidelity "oath" in literal sense. It will be possible to break this oath only by ignoring of the conscience and this word. And it does not do to the person credit. That you had not to arrive disgracefully, be just convinced of your feelings and think whether so your relations are serious to make a declaration of love. Anyway, make what you have to make.