我心里很难过...请翻译英文

I feel sad.

I am very sad.
I am very upset.
I am feeling really sad.

I am very sad.
Or:I am quite sad.
Or:I am feeling very sad.
Or:I am so sad.
还有:好奇爱楼楼的upset是"紧张的"的意思.并非悲伤.

upset 有沮丧的意思,可以在这里用~~~
I feel upset and like someone is heating my heart.

i am very sad!

I am quite sad.