This is the best answer. Design is one of those things that you aren't a genius with 100% of the time. Others out there have their brilliant moments, and constantly looking at those moments from a lot of designers can easily lead to feeling like crap with your own work. Or your skills really could be sub-par. Either way, just keep doing what you enjoy - The only way you'll get better is practice. At the end of the day, if people are still coming to see your work or buy your products, you're as good as they want you to be. Never stop learning, and you'll always be improving :)
This is the best answer. Design is one of those things that you aren't a genius with 100% of the time. Others out there have their brilliant moments, and constantly looking at those moments from a lot of designers can easily lead to feeling like crap with your own work. Or your skills really could be sub-par. Either way, just keep doing what you enjoy - The only way you'll get better is practice. At the end of the day, if people are still coming to see your work or buy your products, you're as good as they want you to be. Never stop learning, and you'll always be improving :)