Is it normal when you've been a caring person to eventually stop?

I don't know what happened to me. I use to be a caring person but now if the other person does not act in a similar way I feel very annoyed and like I'd prefer to take back the energy I feel was wasted on them. I did not use to be like this and wouldn't have even thought about what I got in return. I... show more I don't know what happened to me. I use to be a caring person but now if the other person does not act in a similar way I feel very annoyed and like I'd prefer to take back the energy I feel was wasted on them. I did not use to be like this and wouldn't have even thought about what I got in return.
I think it started when I was very kind to some people and then they threatened my life and did other things that showed awful behaviour, another person manipulated money out of me and then situations kept happening were I would care about someone but they'd be evil or take advantage.
Now I don't feel obliged to do anything for anyone because I feel I'll either get nothing back and feel extremely drained and tired from helping them or that they'll manipulate me or expect it 24/7 or something else.
Is this a normal progressive thing with age, or something bad that I can correct?
I no longer feel good helping people and getting people to pay me to do any work and not do it for free feels like getting blood out of a stone.
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