Completely...I've been in the same position for a while. There are dozens of apps, hacks and sites (some competitive with yours and mine!) launched every day by creators that have identified and are trying to solve legit problems --the same ones you're trying to solve. Thing is, most of these creators don't have 1) the design discipline to make the products really appealing to serve their niche consumers and 2) the forbearance to stick it out during the inevitable long iterative process. Which means that if you have confidence in your own ability to do those things better than a competitor (especially if what you're doing is "not exactly" what the it does) then, onward!