Regret. Such a waste of an emotion.
If fear of failing is holding you back, remember no one ever regrets trying.
If lack of time is holding you back, that's an excuse. If you want it badly enough, you'll find the time.
Now figure it out and go for it.
When you set goals that are too far removed from what you believe you are capable of, you set yourself up for failure. Our brains need to believe that something is possible to give you the greatest chance at success.