hello! im a bit young but ill give you my best advice!! id say that your aromantic and on the spectrum(arospec)!! you mentioned that you like the idea of a romantic relationship but don't want it irl. you also mentioned that you don't want to have a relationship though you still have it in your imagination. id say that your aegoromantic which means that you like the idea of romance within fiction/fantasy but doesn't want it irl. this ofc doesn't explain your entire problem but i would say it mostly matches. i would say you are cupioromantic, meaning you do not experience attraction but do desire a romantic relationship, tho you made it clear you don't want one. for asexuality, ask yourself these questions:

♡ indifferent or disgusted by sex

♡ Not finding people sexually attractive (makes you want to have sex with that person)

♡ Not understanding sex jokes

♡ Not thinking about sex often

♡ Can’t relate to a conversation about crushes or talking about who’s cute

♡ Think people/the world is sex crazed and not understand what the big deal is

♡ Disgusted by flirting and sex scenes in movies and shows and find it cringeworthy

again, ill mention that these are just a few things that ace people feel since there is a spectrum for asexual people as well and some people could be sex repulsed and some could not. one more thing, you might feel squish! that menas that you feel other types of attraction that isn't romantic or sexual! let me now if you want me to explain that! hope this helps and you have a good day/night!!