I stopped helping out people a few months ago.
Why did you stop helping people?
Noone appreciates it.
Well, aside from people who are caring for you or those who you rely on, you're not really obligated to support someone. However, if someone is in need of help and you're capable of giving it then you should do so because it can better someone else's life. Just because they don't show outward signs of appreciation doesn't mean that they don't appreciate you, some people are just too proud to say thank you.
But if they don't appreciate you for it then why bother?
I understand where you're coming from, and it does suck when people don't appreciate the things you do for them but it's not about being appreciated for it. It's about just helping people because you have the ability to. We should always strive to help if we can and if the lack of appreciation really bothers you then you should just not help the people you know don't appreciate you.