meeting men who would be good fathers/partners but they are not for you

Have you had these experiences and how did you approach this? It's not really common that I go out with someone who seems like a great person and would treat you well, and they are attractive, and do everything right, but I'm not really attracted to their personality. I probably have a gut feeling they are not for me but I'm wondering, if I'm not being wise and am missing something in my thinking that's keeping me from success finding a partner. 25f