You actually started first but someone else does it first. do you still launch as competition or quit give up and go back in the closet ?
There is nothing to do but you can rethink and shift a little bit as your thinking. Actually, we have to keep secret our thinking and idea. never disclose to anyone or any internet platform. some people always trying to copy and paste of another idea. so always keep secret your idea.
Basically, Idea can change your life and a good idea can shift your level in your society. keep trying in the pensive mood and let's start.
Theres no really need to shift since you do have the full concept of your idea which means you can still proceed into your original plan and its up to people won where they decide to join or engage on such project.Expect there would really be changes to those who copied your idea.It sucks but you cant avoid since there are people who do love on stealing someones idea.