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Ideally you should take it slowly and you shouldn't find it completely necessary to have sex with her, in fact you might find some relationships to start off in a very romantic way without all the sex. Maybe you miss all the romantic buildup that might be required to actually engage in a sexual relationship with her, in that case, try going out with her, try gazing in her lovely sparkling eyes or even eat with her together before you actually imagine having sex with her. Maybe try going on plenty of dates with her then you might know whether you are actually ready to do it with her or not. Even if you did have dates with her, maybe you should engage it everyday and just leave the sex through the back of your mind until you are actually ready for it.
In summary, try not to rush to having sex with her, go do plenty of romantic activities with her before actually doing it.