Some times i feel sad?

when ever i watch the movie horton heres a who by doctor seus i start crying when they do the pirade because my grandpa use to laugh with me and then he died in grade 2 and i am now in grade 8 i wanna watch that movie again but i am scared of crying at that part. i cant even go to a remerberance day essembley because i cry. can any one tell me how i can cope with my senceitivity???????????Please.