You're 21. You're whole life is ahead of you.
Failure is normal and necessary. Release the fear and embrace failing. Failing means you tried. And guess what? After you assess what went wrong, you learned what NOT to do, so you and try again. No pain, no gain. Keep pushing forward. You say you're in shape. Work out, challenge yourself, keep that mindset of ss self-improvement. You don't learn or grow by doing the same thing over and over and expecting a different outcome, that's insanity. You have to keep tweaking and adjusting to find the right path for you.
Remember, not to compare your journey with anyone else's we are all on a unique path, going different directions, with different stopss, at different speeds. Have fun on your journey, take care and enjoy the ride!