How can i become happpy again!!!!! help [pleaseeee?

In my opinion you need to be happy with yourself and stop depending on other people to make you happy. You talked about old friends and an old boyfriend making you happy but you have to learn to be independent and make yourself happy first. Work on your grades, study hard and get your self esteem back up and once your feeling confident again people will be drawn to you, but if people see that your sad and upset all the time they wont want to be friends with you so just think of positive things and keep your head up! hope this made sense and everything turns out good :)