Wasting Your Time

I don't know exactly the meaning when people said "you're just wasting your time" thing.

I believe what we did and we're doing useful things in our own good. Maybe people don't see what we see that's why they can judge easily.

I hate when people just throw their respectful words like they know everything, not try to be in our shoes. It's not that I'm trying to say that I'm doing best thing but I don't waste my time. Just leave me alone and just do what you should do, don't even bother me. I know what I am doing......