when you feel disappointed, what do you usually do ?

I have fell in love with my teacher elder sister who is five years older than me. what should I do?

Graduation Only a week left, I will be a graduater from this college after these seven days. with a tinge of dismay,as well as some attachment and anticipation, I must say goodbye to my good friends,who have acompanied and helped me in this four years. we have gone through winds and rains together,we also share the smiles. It was really a happy and momorable time! Goodbye! my friends! Separation is unavoidable, I feel that way too,but all good things will come to an end, they say so. We are always on a strange road, watching strange scenery and listening to strange music.Then those strange things become a new part of our life. So there is no need to cry,let's enjoy a happy end. Goodbye! my friends! Four years,that is our most precious days of youth. It is so fast. When tomorrow turns into today, yesterday, we suddenly realize that we are pushed forward by time. This is not a train in still in which you may feel forward when another train goes by. It is the truth that we've all grown up.And we become different. so don't forget the things we once owned.Treasure the things that belongs to us and keep those we shall lost in memory. Goodbye！my friends! We are going to get separated now.I have some words to express.To you who are going to work or being a master,you must work hard to realize your beautiful dream.To you who will take part in the postgraduate exam, especially Three,come on! I know,without friends around by,the preparation will be difficult. But when you feel disappointed and your tears are gonna to drop. Please look up and have a look at the sky once belongs to us. If the sky is still vast,clouds are still clear, you shall not cry because our leave doesn't take away the world that ever belongs to us. We will always accompany with you! Remember the arts building,where we have swayed our many perspirations.... Goodbye! I'll miss you very much!