Been there, done that.

I also have seen competitors on blogs and such that I'm posting on. Usually, I just treat them like any other person. If they say something interesting, I agree. Believe it or not, I have gotten 35% of business by having a relationship with my competitors.

Here's what made the difference for me: my passion. If I 100% believe that what I'm doing is for the greater good, then I know it's important that I keep going because there are people who need my product/service and they will find their way to my site.

Besides...did you ever think that maybe your competitors are worrying about you?