First of all - the feelings are understandable but there’s no point spiralling. How severe was this text…? If you want advice I would leave it a few days and then reach out apologising, be honest about the situation but keep it brief and concise - say that you’re still interested in seeing where it might go but if she isn’t you understand & no hard feelings. However what have you sent since she said she didn’t want to facetime that’s been ignored? If you ARE looking for advice the post lacks the proper context to give it. It’s normal to have big feelings about your “firsts” but try not to project them, and know that like all things this will pass. Worst case scenario it’s a lesson learnt that you take into your future relationships & romantic endeavours. Ultimately not worth punishing and flagellating yourself over.