In love with my Teacher. Help me....?

Im 16, yes i am young, but you shouldnt judge me. I saw him three years ago, my new young teacher and i remember the first thing he ever said to me. Hes 9/10 years older than me, and ive had him on my mind for three years, i cannot look at other boys it doesnt feel right, i cannot kiss anyone else. Ive had so many offers of different boys, all the boys in my school call me pretty, im not very intelligent though in his subject. He isnt the best looking, but too me he's perfect, i love everything about him everything he does and says, i cannot breathe when im around him and i see him five times a week and three years on im still breathless, im leaving school on friday and this is the last time i will ever see him, i cannot eat, and i cannot sleep this feeling is the most definate feeling i have ever felt in my life. everytime im alone i cry. what should i do?