I spent five years delaying the mere thought of starting, now that I started and have been at it every day I feel a dread creeping up on me that I won't be able to finish it within ~2 years even though it's an arbitrary meaningless limit

I KNOW the time will pass anyway, I KNOW I'll think "I just wish I started earlier" when it passes, I know I'll still feel the same and be years ahead than I would be if I did nothing, but I still feel like I'm too old and that my opportunity passed