I need help

As much as I try to loose weight i cant. And right now im just locked up in my room crying because i hate my body. I try changing my eating habits and i cant hold on to the change. And when i do i dont loose any weight. I feel like if something is wrong with ny body and it just doesnt let me loose weight no matter what. Last year i lost weight, i went from 150 to 125. And i gained it all back. Even though i excercise at work, my job is basically excersice running back and forth lifting up to 50 lbs or more sweating all day. I dont know what to do.