YOU SAID:

I wanted to be a track runner before i found out that i am not that good at sprinting so i switched to long distance running.

INTO JAPANESE

短距離走が苦手だと気付く前に、トラックランナーになりたかったので、長距離走に切り替えました。

BACK INTO ENGLISH

Before I realized I wasn't good at sprinting, I wanted to be a track runner, so I switched to long-distance running.

INTO JAPANESE

全力疾走が苦手だと気付く前に、トラックランナーになりたかったので、長距離走に切り替えました。

BACK INTO ENGLISH

Before I realized I wasn't good at sprinting, I wanted to be a track runner, so I switched to long-distance running.