起初，我感到有点紧张，因为我数学不好。

At first I felt a little nervous, because I was not that good at math.

youdao

我当时学画画是因为学习成绩一直不好，语文、数学很少有超过七十分的，即使在小学一年级也是这水平。

Then I learnt painting only because of my poor academic progress: since the first year in the elementary school my scores of Chinese and math had seldom exceeded 70 points.

youdao