What should i do with my hair?

like two years ago in 4th grade through 5th grad i had perfect medium long thick hair to my shoulder's/back but like in the ending of 5th grade it was my Dare graduation and my mom wasn't there to make it all pretty so i cut my hair to it was to my neck like but in the middle.i had cut my hair before a very long Time ago when i was young but it had grew back a little uneven but grew long.so when i cut it i had flat ironed it almost every day and ever since has broken off .i had got braids which was suppose to help my hair from breakage but made my hair even shorter that's when i was in the 6th grade.My hair has improved in its growth but is still short.I am now going to the 7th grade and i want my hair to be long like how it was before.Lots of people started teasing me about being bald headed and i just want my hair to grow back to its regular length .I am 12 going on 13 in August and i am an african american oh and also i have received a relaxer a month ago before i got my hair braided.PLEASE HELP thank you