I thought it was terrible but it isn’t actually that bad.
It’s not as bad as I thoughtは良く使う表現です。思ったより悪くないの意味です。
As I thought - 思った、思った通り
Not as bad as - ~~より悪くない
I thought it was terrible but it isn’t actually that bad は直接翻訳した表現です。
I thought it was terrible - 最悪と思った
But it isn’t actually that bad - 実はそんなに悪くない
When you think it's the worst, it's actually not all that bad.
自分の経験について話したら、「I」を使えます。
I thought it was just awful, but it turns out it wasn't so bad.
一般的に言えば、「you」または「one」を使った方がいいと思います。
Just when one thinks it's the worst, one realizes it's not as bad as they thought.
よく使っている表現があります。ほかの人の名言ですから、これは一番適当かもしれません。
It's never as bad as you think.
It could always be worse.