I have a tendency on idolizing love

I am 36 and I have never had a girlfriend, so I feel quite outcast.
All my life I have met girls but just in a very shallow way. The problem is that sometimes in my life I have just met a girl one day and I fall in love with her inmediately and profoundly.
I have daydreamt all the day with a handful of girls about getting married, creating a family, etc. But girls that I have sopken with them very few times.
I am aware that this is not falling in love with that girl because I do not know anything about her, but bot matter how hard I am aware of this I always daydream, above all in my bed.
I fall in love with the perfect girls I have created in my mind with real face, but not with these girls because I have had a very short interaction with.

Maybe if I had met these girls more profoundly I would have stopped idolizing them bc I would have realized that they are not perfect.
I have a vey childish way of getting in love, idolizing to soon.
I think the reason is because of my poor social life that I feel alone so I miss a person to share my life with. I always had problems to have social relationships because of my ADHD inattentive type.
And if I met new people I would realize that this girl is not so special in comparation with so many many girls.

Having said that, I want to ask a question. Last year I told a girl to take a coffe but she refused it.
I have spoken her several times after that. Could she change her mind about me?. Could I tell her to go out again?.
I still spend a lot o f time daydreaming about her. Thank you in advance.