Low O2 level or Depressed: Did I make the right choice?

Does anybody else feel like me. I was diagnosed with COPD only 2 months ago and never  heard of a portable oxygen concentrator until things started changing in my life. Not sure what the word is: embarrassed, disgusted, ashamed, guilty, but I don't like being seen in public with my O2 tanks and cart. We wanted to go to the movies for the first time since I was diagnosed.  I brought my O2 but left it in the car. I knew from the car through the side entrance and up the escalator was appx. a 3 minute walk. Then I could rest and about another 2 minute walk to our seats. I had my oximeter with and kept checking. When I left the car it was 92%. After the 3 minute walk it was 88%. Then after the rest back up to 92%. Up those stairs in the theatre  knocked me down to 79%. After sitting for 5 min. it was back at 89%. Then through out the whole movie it pretty much stayed around 93%. If I would have said I'm not going because of my O2 and COPD then I would have given into it and would have been upset with myself. Sure I was low there on my readings just a little, but at least I was happy and I didn't let it beat me. Did I make the right choice?