Spent the first part of my life making negative impact in the world, so yes I have impacted many lives in this way.
Once I finally grew up and got my head out of my ass things moved forward for me. Do I worry about impacting lives? no not a bit I just live each day and do the things I know are right and if someone gains a positive experience from it then I have made an impact. Doesn't matter if I know I made an impact or not, I simply know that today I did what I felt was right and someone somewhere has to have noticed and benefited from it.
If you go through life trying to only succeed at all times you will only see the times you failed, if you simply go through life and do your best then success will follow