If I'm not sure about ..., maybe I shouldn't do it.
If I'm debating whether or not I should ..., then maybe it's best that I don't.
この場合、次のように言うと良いと思います。
ーIf I'm not sure about ..., maybe I shouldn't do it.
「…について迷うなら、やめておこうかな」
ーIf I'm debating whether or not I should ..., then maybe it's best that I don't.
「…をするかどうか迷うなら、やめたほうが良いかな」
詳しい例文で見てみましょう。
ーIf I'm not sure about buying a new car, maybe I shouldn't buy one right now.
「新しい車を買うか迷うなら、今は買うのをやめておこうかな」
ご参考まで！
カナダ 
