Cop-Out or Not?

I stopped one of my volunteer jobs today, at least for July. I didn't want to exactly because I always feel so guilty and selfish. This particular job was going to an Alzheimer's unit and spending an hour with the residents. Originally I went to play music and toss a ball with them. Some of them got past that and are unable to do that anymore. So I started doing more 1:1 things with them. Walking, visiting, looking at magazines, etc. Some of them are very aware whether an activity is childlike and patronizing. For the past several months I have felt frustrated every time I walked out. I couldn't actually put my finger on what was wrong, but knew I felt no pleasure or assurance that I was doing what I should have been doing. The staff seemed mostly indifferent to me, sometimes moving the residents into another room just before I got there, instead of leaving them together in the dining room. They played "relaxing music" all day long so music was not a treat for them. They didn't seem to want me to stimulate the residents because they might get out of hand. Sometimes they would turn my music down or turn it off. Well, I am quite experienced at working with dementia victims and I know how to stimulate them and then bring them back to a state of relaxation. Sometimes staff conversations went on while I was trying to read a story or do an activity with the residents, disregarding my attempts to give the staff a little bit of a break. I think I mainly felt I was intruding and disrupting their routines. I will still visit but not at an appointed time as before. Perhaps I can reconcile myself to a better plan. Boy, is this a wa wa thing or not? Just pretend I'm crying on your shoulder, my friends.