>>81740146 (OP)
Its infatuation / lust, and you know it because you feel nervous talking to these girls and feel like you almost need to force them to like you, which is really just your body deep down knowing that you're not compatible at all.
When you find the right girl you might not even find her attractive at first but you will find it effortless to talk to her because your personalities and view of the world will be so in sync with each other. You won't feel the need to impress her because she already seems to like and admire you when you're just acting like you normally do. She will put in the effort to make conversation with you and do nice things for you, there will not be any doubt in your mind as to whether she wants to be around you or not.