That you have to be in the valley or get into YC to build a successful venture backed startup is just not true. I know it's hard to go against the grain and it's hard to bootstrap, but just focus on getting users and customers and traction and you can figure the other stuff out later. Don't let it paralyze you because it's just an insecure illusion (I know, I was there at one point and realized it was all in my head)

Also there are other accelerators if you really want to go to one (ex: Digital Ocean is out of TechStars).