Can someone be truly in love at sixteen?

Do you think that two teens can really be in love? Even at sixteen? How do you know if you are really in love? What do you think? Do you believe in love at first sight?

Cause I have known this boy for almost a year now and we just started dating almost two weeks ago and I have liked him since the day I met him. I have never liked a guy this much before, ever and I have the urge to tell him I love him, but do I?