“我发现我并不擅长数学”用英语怎么说

“我发现我并不擅长数学”用英语怎么说=======见如下===========结果 (英语) 1:I found out that I was not good at math结果 (英语) 2:I find that I'm not good at math结果 (英语) 3:I found that I was not good at mathematics.结果 (英语) 4:I find I'm not good at math.