You are 19, my advice is go and have sex with him if he is agreeable, the experience will either be good or bad, but you will definitely figured out afterwards if it is just a case of extreme lust for a good-looking guy, extreme horniest from reading to much manga, or if you want something a bit more tangible. Just make sure you practice safety first. Have fun
I just need to know how this story ends. I can’t picture a happy ending or ML (i.e., Hyung) falling in love with crazy asa MC.