You won't know until you actually do it. If that's what you've always wanted to do, having already done the hard work of ATPLs/earned a PPL, the worst thing you can do now is to not pursue it and then live with regret.
On the other hand, the fact that you're doubting yourself at this stage, could maybe indicate that you don't want it that badly after all? In which case stay clear, as it takes a lot self-motivation to get through the whole of what's to come.