Do you believe in karma?

I am a very helpful, kind, righteous person. But when Im stuck, there is no one to help.It has always been like this. I have observed that each and every time, to get a particular thing, I have to go through lots of hurdles. But others don't. There were several instances wherein my acquaintances were waiting for me to solve the problem and by that time they finished other chores/ enjoyed life. And, I was struggling, wasting my time, energy to find the solution. I don't have any friends, even though I try to be nice. It always makes me sad. I feel, there is no such thing as karma. What are your opinions? (Good fortune and me are like opposite poles)