It's not necessarily that I practiced for hours every day, but it's very disappointing.
「毎日何時間も練習していたわけではないがとても残念だ。」は英語で「It's not necessarily that I practiced for hours every day, but it's very disappointing.」という意味があります。
毎日何時間も練習していたーI practiced for hours every day.
わけではないーIt’s not the case that・It’s not necessarily that
残念ーToo bad・Disappointing
It's not like I practiced for hours and hours every day, but I was very disappointed nonetheless.
この場合、次のような言い方ができますよ。
ーIt's not like I practiced for hours and hours every day, but I was very disappointed nonetheless.
「毎日何時間も練習したわけじゃないけど、でもすごく残念だ」
nonetheless「とはいえ」
ご参考まで！
アメリカ合衆国 
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