<human>: This year I moved into a big city.  I was raised in the suburbs and have had a really tame life to this point.  I'm a timid guy and typically keep to myself.  I've always done my best to be nice and avoid conflict (bad, I know) and I've always been optimistic about my future.  I got a job as a delivery driver while I was getting on my feet here.  In the course of this job, I ended up dealing with high-stress situations daily, involving disgruntled customers.  I put up with fair share of verbal abuse and general rudeness.  Over the weeks, I grew a thick skin and an attitude.  

The thing is these experiences, while not life or death situations, were really traumatic for me.  The people I dealt with were really sad and angry people (a lot of addicts, mentally ill, not my usual crowd).  And I dealt with them with such frequency that I've lost touch with the optimistic world I came from.  I'm in a constant state of anxiety now.  I feel like I can't relax around people.  The world has a really animalistic feel to it and I feel like I have to be on guard at all times.  I'm not optimistic anymore.

Just now, I'm at a cafe.  I spilled the tea I just bought all over the counter.  And the barista was really cool about it but I'm on the verge of tears worrying he's gonna chew me out.  This is how I approach most social situations now.  Everything is a potential fight.  

This is not me, Reddit.  I'm tired.  How do I find the good in people again?  Or, at the very least, how do I deal with this and move on with my life?

Give me a shortened version of the text
<bot>: I'm a wuss that can't handle being yelled at every day.  How do I get back to my normal, relaxed state of being?