So I don't know if this is bad or not...help!?

So after I ate dinner I went on a 50 minute walk then did 62 crunches and 65 squats then messed around danced for about 20minutes...i just ate a small bag of cheetos the snack bag...did i just ruin all the work i did after dinner bc i feel guilty=/ i am trying to lose weight but it is hard for me to stay away from junkfood when my dad doesnt stop buying it..