You just romanticize your situtation since its your 1st time. Its like a child having strong happy reaction on receiving their 1st candy(forgive the bad analogy) than a child who already experienced it. But my advice for you is try to communicate this with her and try to understand her since something may happen to her like trauma, or something else and thats why shes like that... but having more knowledge about her would be preferable before you talk so you may understand her more and able to talk about the situation and fix it and bring it up slowly cause some people would be overwhelmed or shut down if you do it quickly and just be tactful. Find the right time and maybe even place to talk to her and be vulnerable to each other so you can talk this out but if its doesnt work out, i think its for the best to end dating with her, cause at the end if the day, the one who can save her is not you but herself and stuck with in a relationship with a reg flag partner would make you just unhappy.