It means you have good standards, and you are a good person, and you have a good understanding of values for a young age.
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The brain is physically mature when a person reaches their teen years. This, however does not mean that the person is mature or has such mental processes to be considered mature.
Being morally straight means to live your life with honesty, to be clean in your speech and actions, and to be a person of strong character.
Superman
A person is morally bankrupt if his actions display a complete disregard for ethical values or principles.
A puritan.
Have good morals.
The term morally wrong refers to an act of human behavior that is not accepted as right by society.
Incapable of being morally corrupted.
A virtuous person is someone who consistently demonstrates qualities such as honesty, integrity, kindness, and compassion in their thoughts, words, and actions. They strive to do what is morally right and are guided by principles of goodness and excellence.
The phrase is morally defective. It means a person who has totally lost his or her sense of right and wrong. (Alternate phrase: morally bankrupt)
a person who is not mature and is childlike