Why am i feeling like this?

Idk why but im feeling sad with no luck,i feel like i just want to lay in my bed,and i always think that next day will be better,every night i just lay down and i feel sad for no reason,i feel like i have no friends and im on my own,i listen to sa music and idk how to describe it really ive been like this ever since it was friday my graduation ive been like this and that day i lost my boyfriend and missed my friends