I've made up my mind not to have a late-night snack.나 이제 야식 안 먹기로 결심했어.

I've made up my mind not to have a late-night snack. 

 나 이제 야식 안 먹기로 결심했어. 

 

[영어식 어순 익히기]  

I've made up my mind / not to have a late-night snack.

나 결심했어                         /  야식을 먹지 않기로 

[make up one's mind : 결심하다 / have a late-night(midnight) snack : 야식을 먹다]