Its good that you got it all out, but next time just writing it on paper and burning it is a better idea.

When they see that letter they are going to know exactly how you feel. I doubt it will make them feel bad, if anything they will use it to cause you more pain.

Time to focus on you now. Get new friends go new places meet new people. Fill your life with better things. Take up a hobby maybe try sowing. How good will it be if you can make yourself a great outfit that looks Fab on you and no one else has it!

Time to move on and forget the past. Make new memories and a new future.

Don't forget your better than them. Be successful in what ever you want to do in life and ALWAYS smile!