I share your worries. When you see how the big players flex their muscles on trade shows like E3 or GamesCom, you feel very little and very lonely. It is disappointing to see all the glory in its shiny and polished form while you know that all you do at home is struggling.

The reason why you should keep on with your game is because quitters never win. Even if your game takes forever to be done - do it. Because if you don't, it will never exist.