I would never be able to do that. I’d be too worried,
I could never do that. I’d be too worried and stressed.
こう言えますよ、
❶ I would never be able to do that. I’d be too worried.
分析しましょう。
I would never be able to do that. は「私は絶対そんなことできない」です。
I’d be too worried. 「心配しすぎちゃう」です。
ですから、
I would never be able to do that. I’d be too worried. は
(私は絶対あんなことできない。心配しすぎちゃう)
または、
❷I could never do that. I’d be too worried and stressed.
(あんなこと私には無理。心配しすぎて ストレすになる)。
と言えますよ、参考に!