Sounds like a conflict between wanting to do something you love, and wanting success and fame. Nothing wrong with either of these things, or trying to have both. But what you might be missing is that the way you pursue these things has a much larger impact on the outcome than simply whether you make an attempt or not.
You might have been reading all those stories of startups, and now you're stuck in a box shaped like all those stories. That you have to start a startup at all, or that you have to go about it in the way those stories told. You might think that's your only path. But the only limits in this world are the ones we put on ourselves.
Meditate on what you really want, at your core. Start the wheels turning of thinking of ways to get those things that aren't immediately obvious or don't seem likely. Consider a world in which you didn't have fear, doubt, anxiety, or other kinds of limitations. Which path would you choose? What are all the ways you might use to walk that path? You don't need to know the whole path to start walking on it.