My(M18) girlfriend(F18) doesn't want to have sex

So I've been into a relationship since 5 months, we have been very open about sexting and other online stuff since starting and ngl we both were enjoying that stuff too, and both mutually decided to have sex for first time after our 16 dates so when we completed that time phase I initiated that now we should yk and she completely denied and said 'jaruri thodi hai mujhe nahi karna it's too early' ab I would get this point agar vo shuruwat se esi hoti magar vo to mujhse bhi ek level aage thi insab mai, last 1 month se I noticed some changes in her vo sexting ke liye bhi mana kar deti hai and hamara argument bhi hojata hai but vo esi thi hi nahi idk vo kyu change hogai hai, we have even talked about this tu ekdum se asexual kyu hogai hai don't u feel anything and uska jawab tha haan mai change hogai hu magar vo mujhe bhi nahi pata kyu. I genuinely love her and can do anything for her but I still wanna have sex, am I doing something wrong?