2 sentences

1. 他并不因为出身低贱而感到自卑。

   tā bìng bù yīn​wèi chū​shēn dī​jiàn ér gǎn​dào zì​bēi.

   He does not feel inferior because of his humble origins.

   Source: Dong Chinese Dictionary

2. 由于成绩不好，他在同学面前感到很自卑。

   yóu​yú chéng​jì bù hǎo, tā zài tóng​xué miàn​qián gǎn​dào hěn zì​bēi.

   He felt inferior in front of his classmates because of his poor grades.

   Source: Dong Chinese Dictionary