how do we know that we're already inlove?

based on my experience, you can tell you have fallen in love if you feel that you are becoming a slave than a master of yourself. you are doing everything to please the girl. you sacrifice anything, your studies, your allowance, your time, even your work just to be with her. you are likened to a person with psychiatric disorder. falling in love really makes you mad. you want to praise and say good things about her all the time. you can't sleep, eat and focus on things you want to do. after all, this is LOVE.