i don't remember ever being bullied, but i always felt inferior to everyone.. and though i can't relate to your past 100%, i do have a bad past that i had to let go of, as well.. i grew up with an alcoholic mother, and there were a lot of things i had to deal with that no other kids my age could have even imagined. i struggled to put on a normal face at school and with friends, but in the end i was always going home at the end of the day to my drunk/depressed mom, and it tore me apart..
i thought that i had delt with it fine, because it made me a lot stronger, and i just chose to ignore what i could.. but maybe my sudden severe anxiety/agoraphobia came up because i had burried the past alive, and it came back at me... i guess what i've done, is understand that what happened is what happened, those were just the cards i was delt, i handled them however i did then, and the ONLY thing i can do now is look forward.. looking to the past doesn't do anything for you.. it may have been easy, or in our case, it may have been tough, but it has made you what you are today. and all you can do is be proud of that and continue to work through your live molding yourself to be who you want to be..
honestly, i can say that i wouldn't necessarily change any of the horrifying things that i had to go through.. sure, it would have been nice to live a perfect happy childhood (up until i was 18), but who knows who i would be today? and as far as my personality, my attitude and 'who i am' goes, i love the way i am.. i'm tough, i'm strong, i'm honest, i'm loyal, and i've learned many many life lessons that a lot of people i know can't even grasp... take the positive things from the past, and leave everything else behind. you have to accept it for what it is, and say goodbye to it. because it's not today and it's not tomorrow, it's yesterday, and you don't have to let yesterday have anything to do with your future if you don't want it to.. be strong, accept what happened to you, and take it as a life struggle that you've overcome, you're better for it.. i hope you have the courage to move on soon

best wishes to you!