Do I have a right to be upset?

i was in school today and i got made fun of.this girl adi invited me to the beach and i tried to say that i couldnt go cause i have things to do but this kid named tyler said that the real reason i cant go is cause i cant swim. i tried to counter to it but adi and her friend jess and even my best friend italia start to laugh at me. and then i try to counter to it again and jess starts saying that they should let sharks eat me in the ocean and all of these jokes about me starting to drown. it hurt my feelings and i wanted to say something but i started to get angry and when ever i do, my eyes start to water. i cant help it. i tried really hard to push the tears back but its hard for me to when i start. and all of this happens while the secretary of our school is watching us. i told her that i was being bullied and that she should help me but she just laughed with them. then after school on facebook i told my friend italia that it hurt my feelings when she laughed. she said i was being too emotional and that i needed to get over it and that im wrong. i told her that shes MY BEST FRIEND and that im trying to tell her that she hurt me and shes just laughing at me. then she wrote sorri a bunch of times and said r u happy now. so i just let it go but do u think that i have a right to be upset? do i have a bad friend? or am i too emotional?