How do I know I'm in love?

I think I'm in love but I'm not sure. Lately, I've been real honesty with him than anyone. I can't stop thinking about him even if I'm not busy. I had like seven dreams about him, one about marriage, what type would I rather married Prince William or Arist, there for me for twins in the future, mad at him, and meeting up at school in the morning as usual. I can't sleep right away until three hours are gone. He's different and unusual and I love that. I read one of his work from his homeroom saying that he wants to be a great father. He knows how to fix the car and he loves to FL so much. I love FL so much too also, there are famous places I would like to go to. I can't stop thinking, talking, and texting and or emailing him so much. I really worried about him so much and he worries about me a lot. He doesn't wants me to change at all and I don't want him to change at all. Lately, I've been having no lunch or lunch on every other day. Am I in love or just beginning? I'm 17, 9th grade?