"It is the heart at work that determines your success not hard work alone!"- Raghuram Ananthoj
It does not matter how hard you work, if you do not love what you are doing, if your heart is not there, you are not going to be successful. 
If you are not happy with what you are doing, do not just quit. Before you quit, ask yourself,
"Why am I not happy with my job?"
"Is it about me?"
"Is it about the work?"
"Is it about the management?"
Or, "Is it about how I see my job?"
These questions are very important. To answer them correctly, you must be honest with yourself.
Because you won't grow if you are not honest with yourself, with your feelings. 
As the late Steve Jobs famously said, "The only way to do great work, is to love what you do." 
The question is, "Do you love what you are doing?" If you don't, then what are you going to do about it?
Because if you do not do something about it, nothing is going to change. And for something to happen, something must change. If not now, when?