Don’t apologize for your failure nor for your success.
If you failed at something, at least you tried it. Taking initiative is one of the best treats a person has.
If needed you can always start over from zero, you should never stop improving yourself.
If you are successful that is something you work hard for, so be proud of it.
Just do the best you can do and enjoy while doing it. You only have one life and one shot for most in life, but don’t forget to shoot.