Based on the two flashbacks that I can remember, it's a possibility. I don't think I believe it, but I wouldn't say you were crazy for thinking it.
1. Elliot getting pushed out of the window and barely talking to the doc as his parents argued points to him always having been quiet, in his own head, and off
2. Elliot stealing money while working at his dad's shop, him lying, then his dad giving him a lesson then taking him to the movies
could point to your Mr. Robot actually being Elliot's base personality.
I don't think I believe it though, but I'll let it cook as a theory