I always felt inferior to others before.

以前我总是很自卑。

You may feel that you are inferior to others despite what you've accomplished.

虽然取得了成就，但你还是觉得自己不如其他人。

I always feel frustrated and self-abased and I always feel that I am inferior to others.

我总是感到沮丧和自卑，我总是觉得我不如别人。

You might feel that you're somehow inferior to others because you think you can't measure up.

你可能会觉得不如别人，因为你觉得自己无法达到标准。

They may doubt themselves constantly, especially in social situations and see themselves as inferior to others.

他们可能总怀疑自己，尤其是在社交场合中，总认为自己不如别人。