I understood how I was being perceived by others. / I understood more or less how it is that others see me.
Since I understood this, my life has become much easier!
Because I am no longer affected by how others see me.
ご質問ありがとうございます。
①
"I understood how I was being perceived by others."＝「私は他人にどのように見られているのか分かった。」
または、"I understood more or less how it is that others see me."＝「私は大体、他人が私をどう見るのかわかった。」
②
"Since I understood this, my life has become much easier!"=「これを分かってから、人生はもっと楽になった！」
③
"Because I am no longer affected by how others see me."＝「なぜかというと、他人が私をどう見るかに影響を受けなくなったからだ。」
ご参考に！
アメリカ合衆国 
