Knowing if you geniuenly have feelings for someone.

I don't think it's stupid to not have feelings for anyone. It could just be that you haven't found someone who clicks for you, you could be aro/ace, or even demi and that's okay. You could be something else entirely and that's completely okay too. Just because you lack having romantic feelings for someone doesn't make you stupid. I do hope you're eventually able to figure it out, and don't worry if you're not sure yet, it's okay to not be sure about how you feel 

I guess it's just something you sort of know and it just comes to you. Don't try to force it or repress it, you'll only be doing yourself harm either way here.