feeling weird !

lately i've been feeling weird when i am arround people and my bf . i actually say staff that has no meannig !! i don't know what i say ! it is just weird things or things that maybe seems awkward to them . also i feel that i want to be by myself all the time and i am craving food (fast food and sweeties ) . feeling a little bit depressed so a lot of people adiviced me to start writing and it will help get over my depression but i don't know how to start . help !!! SOS tell me why i am weird !!