It was scary feeling that I was so high off the ground.
地面 ground
遠く high (この場合)
感じて feeling
怖かった it was scary
「地面がすごく下にあるように見えて」は The ground looked like it was way below me で表現できます。
例文 It was scary feeling that the ground was moving during the earthquake.
「地震の時に地面が震えて感じて怖かった。」
参考になれば幸いです。