i do interpreting on the side to make some money.
today i went to a job. before going to the job, i was very nervous around girls. i couldnt even say hi to anyone.
then i went to the job and the girl that i was interpreting for was this paranoid bitch. as soon as i introduced myself, she says "i speak perfect english, i never requested an interpreter"
then I asked to see the letter that she received from the government to see where the confusion is. she gave it to me for a second, then she grabbed it from me in a violent way.
then she started cussing me out saying she doesnt need an interpreter.

after this, I was told i could leave. so i left and approaching was much easier. i think subconsciously you think "if i could handle that bitch, i can handle anything" i think it's a "what doesnt kill me make me stronger" concept.

so i came to the realization that i need a job or an activity where people will bitch at me all the time. what kind of jobs would help me in this regard?

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I have not failed 10,000 times. I've just found 10,000 ways that won't work. - Edison

The reason you were able to do approaches easier after this was because you got rejected. Think about it. You already had the worse thing that could happen to you in an approach, happen (she rejected you). Thus you are are able to do more.
Another way to look at this differently: I was always afraid of how my dad would act if I got an F on an assignment. One day I did, and I never saw it coming; I wasn't prepared. Once my dad saw that I got an F, he yelled at me. So the next time I received an F, I knew what was to come. I would just be yelled at, but I was going to be okay. I was not going to be injured or anything else. Just be yelled at.
So instead of looking for other jobs/activities where people will bitch at you, remember what happened with that girl. Write it down on a sheet of paper everything that happened in your interaction with her before you go out. You will remember the worse thing that could happen, and be okay with it, killing off a lot of your approach anxiety, thus being able to do more approaches.

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---Red's Journal
Motivation Mindset="If I can do it, it can be done"
No Fap Mindset="If I fap, I will turn into a god damn retard"