Are We In Love, or is it just a phase?

Me and this girl i know have only known each other for a few days and we already know a fair bit about each other. But the main reason behind it is because apart from a few differences and i mean like 3 - 4 differences we are the same, like a carbon copy. So yesterday we kissed and i felt like something happened and that "sparks flew" in a sense. But it was a really powerful feeling when it happened and after we kissed i felt like shouting to the heavens and i couldn't stop smiling and i have had erflies in my chest and in my stomach ever since. She takes my mind off things and everything she talks to me or i think of her this feeling gets stronger and ive had them for over a day. So i spoke to her and she says she feels exactly the same. That she too has had erflies in her stomach and chest ever since yesterday and she hasnt stopped talking to me since. We both agreed we wouldnt ask either out as we only just know each other, but my head heart and gut are screaming at me to ask her out. I personally feel that this could go a long way and that theres a majorly strong connection between us. im 17 and shes 14 but i care not for her age or looks but for her. she makes me feel happy and like life's worth living. What do i do? should we have a try at this or should i wait to see what blosoms?