What is 我が身 and how is it justified in this sentence?


First off, I tried looking at the explanation
[here](https://japanese.stackexchange.com/a/6522/1328). However, the reasons
for 我が家 don't seem to apply to 我が身.

Here is the excerpt that doesn't seem to apply from Jesse Good's post:

> The above also applies to 我が母校、我が国、我が家族、我が妻、我が故郷、etc. They all imply that
> you have a deep relationship, you are proud of them, show affection, etc.

Obviously 我が身 is not stated there (possibly intentionally?). I'm unsure how it
is possible to "have a deep relationship, be proud of, or show affection" to
yourself.

The sentence that I read:

>
> だから、自分のことを、なかなか他人に伝えたり、分かってもらえなくて、悲しい思いや、傷ついたりすることも多く、ああ、なんてぼくは損な性質に生まれついたんだろう、と
> **我が身** が腹立たしく、悔しく思ったことも一度ならずあった。

What is the purpose of 「我が身」 in this sentence? Is it possible for it to simply
be substituted with 私自身? Also, what is implied by 「我が」 in 「我が身」 that is
different than the 「我が」 in the examples from the link above?




我が身 in this sentence makes it feel like you are "looking at yourself from the
outside" more than if you would use 私自身. I believe you could substitute わが身
with 自分自身 or 私自身, however I think 自分自身 would be a better fit because it feels
more 客観的. Also, 我が身 doesn't necessarily mean わたしの身, it actually can refer to
the 1st, 2nd and 3rd person. Although the 2nd person usage is archaic and not
used anymore. So, although it might sound strange to "have a deep relationship
with yourself", think of the usage as talking about yourself in a somewhat
"detached" way which might help you see the connection better.

