I agree with the previous answer and add that getting tired of kindness is normal (more precisely, naturally). Especially in the following cases:
If you have low self-esteem and consider everyone to be benefactors, even if someone just gave you a pencil.
If this kindness is "caused" to you by a person you, for some reason, do not like. You start to feel indebted, which is unpleasant in itself. And then there's also a similar personality. This has happened to me. I barely broke the course of my thoughts that "I am bad, but the person turns out to be wonderful, what a fool I was that I thought so badly about this person." You do not like a person - you should not love him, even if he gives you iPhones. This is his decision. Say thank you and remember the main thing - you don't owe him anything.
You are afraid that, as in the second paragraph, you will find yourself in debt (due to unwelcome kindness). Remember that if a person has done good to you from the bottom of his heart, he will not be offended if the next time you reasonably refuse his request. And he will not consider that he "bought" your help for the future. If someone does good with a selfish purpose, and then gets offended, then he went. Don't even worry.
Learn to accept goodness, you probably feel that in many cases you can relax and be glad that you are surrounded by good people, and that you yourself deserve this attitude. Just like that.
Apparently, you are an introvert)
I also get tired of communicating with people, I need to be alone to "recharge my batteries." I do not like to communicate about anything (without a topic or purpose) and superficially, formally, although for many it is considered the norm - people want to either speak out, not thinking about whether others need their information, or ask questions like "how are you? " without thinking about why they ask this.
Surely you have interests for which there is not enough time, but here you have to spend time listening to what you are not at all interested in and answering formal issues)