Unless the project is aimed for developers (eg: a development framework, in which case you WANT them to criticize it if it makes you learn even more), you shouldn't worry. But even then, there are many open source projects aimed for developers that are crap, butyet people love them because they go to the point (think of Codeigniter, which is very poorly architected, and yet it is the most popular php framework)
If it is an application for regular humans, they will probably only care about the results.