I hear you. When I was 16 -17 I worked in a nursing home. It was very depressing. Half of the residents never had visitors, and many were suffering from severe dimensha. However I did appreciate spending time with the residents (those without family, or those who's families where "too busy" to make a visit). In the end it was worth knowing I made someones day. I will admit it was very hard, and sad at times. You really do become close with the residents and when one passes, it is devistating.
Hopefully you can find another job that suites you. I completely understand where you are coming from. Some people can handle it, and for others it is too much. I appreciate you being a realist, and fessing up that it isnt for you. Its amazing to see what really goes on... Once you are on the inside. I've seen how poorly residents can be treated, first hand... Hence I refuse to ever be put in a nursing home.
You'll find something, soon... Sending you some job vibes