Depression is a thing that just takes time, now i am no expert who studies depression, but something that has worked for me, is just doing things i enjoy, for me that would be playing soccer, and for you maybe would be kicking the footy around with some friends, just do what you enjoy, and try to get your mind off the bad things that have happened. As you always get told, everyone makes mistakes, this is completely true, don't believe you are different just because you made some mistakes. If mcsg doesn't help, e.g. you get bullied over mcsg (get called ez, bad etc) taking a break is always a good thing, i took a break late last year, and playing mcsg was twice as enjoyable. As people have mentioned trying to forget about the negatives isn't the greatest. This of course makes you think about the negative, just remember to stay possitive. I have experienced depression, i completely understand what you are going through, for me it just took time of doing what i enjoyed.
Remember, stay positive and don't let your negatives take over your life.